Avail free shipping on minimum orders of £75
Profile
Menu
Menu
(0)
Search
Shopping basket
You have no items in your shopping basket.

Accepted Payment Methods

45 White Mailing Envelopes, 100 GSM Mixed Sized Self Seal Greeting Card Envelopes, Invitation Envelopes for Posting Mailing

Best In Quality | Top Selling Item

310 review(s) | Add your review
£19.99 ex. VAT
£9.99 ex. VAT
Want to get it delivered Tomorrow?
Order within 13 Hrs 42 Mins via Next day signed for or Special delivery
ColourWhite
Closure typeSelf-Seal
OccasionGraduation
MaterialPaper

About This Item:

  • Mixed pack – 45 envelopes in DL, C5, and C4 sizes for various mailing needs.
  • Premium quality – made from 100 GSM high-quality durable paper.
  • Self-sealing – easy-to-use adhesive strip for a tamper-proof seal.
  • Security tinted – blue printed interior for confidential document protection.
  • Multipurpose use – perfect for home, office, business, and ecommerce.
  • Bonus envelope opener – includes a random color envelope opener for convenience.
You may also like
Picture of Preschool Learning Activities, Educational Toy and Game, Back to School Supplies, Reusable Activity Mats, Gifts for Students, Kids, Ages 3, 4, 5, 6

Preschool Learning Activities, Educational Toy and Game, Back to School Supplies, Reusable Activity Mats, Gifts for Students, Kids, Ages 3, 4, 5, 6

Colour:Multicolour
Material:Polypropylene (PP)
Recommended uses for product:School
Mounting type:Tabletop Mount

About this item:

  • REUSABLE ACTIVITY MATS: I Can Write includes 14 repeatable activities designed to help kids strengthen their reading, writing, and problem-solving skills through practice and repetition!
  • INCLUDES: 6 Double-sided Activity Mats, 2 Skilly Billy Dry-erase Pens, 1 Duster Cloth and an Achievement Certificate.
  • AWARD-WINNING PRODUCT: Winner Of The 2022 Parents' Picks Awards as one of the Best Educational Products in the World.
  • LEARN THROUGH PLAY: Kids learn best through repetition! Our mats are easy to clean, allowing endless practice to reinforce and perfect their skills.
  • FUN EDUCATIONAL GAMES: Designed by educators and play experts, each mat offers engaging, age-appropriate activities that make learning exciting and enjoyable.
  • KEY LEARNING OUTCOMES: Learn patterns and strokes, alphabet, numbers, writing words, colours and shapes, body parts, calendar planning, and creating sentences.
  • ENCOURAGES INDEPENDENT LEARNING: With easy-to-follow activities, kids gain confidence as they explore and practice new skills on their own.
£39.99 ex. VAT From £15.99 ex. VAT
In stock
Picture of Four Colour Plastic Base Ten Set | 121 Pieces | Hands-on Maths Manipulative for Kids | Teach Number Concepts, Place Value and Measurement

Four Colour Plastic Base Ten Set | 121 Pieces | Hands-on Maths Manipulative for Kids | Teach Number Concepts, Place Value and Measurement

Material:Plastic
Colour:Assorted
Educational objective:Counting Skills
Number of pieces:121
Theme:Base Ten
Special feature:Washable
Model name:Plastic Base Ten
 

About this item:

  • COLOUR-CODED FOR LEARNING -- These plastic base ten counting blocks include 100 yellow units, 10 green rods, 10 blue flats and 1 red cube. Practice decimals, place value, counting, operations and more.
  • HANDS-ON LEARNING --These maths cubes allow students to create visual representations of arithmetic and algebra exercises using the ones, tens, hundreds and thousands cubes.
  • HELP KIDS ACHIEVE MATHS STANDARDS -- This set of base ten manipulatives can help kids understand grade-appropriate maths material such as place value, decimals, length and volume.
  • BUILT TO LAST -- Made from durable plastic, these decimal base ten blocks can withstand numerous drops and years of use. They're also easily washable.
  • PERFECT FOR HOME OR CLASS USE -- A staple learning resource for classrooms, this set of counting blocks is small enough to be used at home. Keep a set with your teaching or homeschooling supplies!
  • PLAY, LEARN & CREATE -- Our products inspire children to play with purpose. Play is the best teacher! Our high-quality, educational resources fulfill learning needs up to 12 years.
£34.99 ex. VAT £19.99 ex. VAT
In stock
Picture of 1000 PCS Reward Stickers for Teachers, School Stickers for Kids in 16 Designs, Motivational Stickers Teacher Supplies Training Stickers

1000 PCS Reward Stickers for Teachers, School Stickers for Kids in 16 Designs, Motivational Stickers Teacher Supplies Training Stickers

ColourLight Blue Or Cyan
ThemeEducation
Cartoon characterBubble
Special featureSelf-adhesive

About this item:

  • 【Reward Stickers Set Including】2 rolls teacher reward stickers contains 1000 stickers with a diameter of 1 inch, including 16 different designs, small and convenient to use.
  • 【Excellent Motivations】The reward stickers are perfect for motivating students with a behavior chart, chore boards, incentive program, simply report cards, note cards, festival decoration, greeting card messages, packaging or creating a craft project.
  • 【Perfect for Teachers & Kids】These teacher stickers are good assistant for teachers and parents. A small motivational sticker can make a child feel recognized by others when they complete all the work independently, pass tests, good behavior, or follow instructions. This is more meaningful than verbal praise and material rewards.
  • 【Easy to Use & Remove】High-quality self-adhesive stickers are easy to peel and stick firmly on paper, clothes, behavior charts and more.
  • 【Wide Application】Various of events like group education, chore boards as well incentive program. Also suitable as book or storage label, awards and crafts reward systems.
£10.99 ex. VAT £5.99 ex. VAT
In stock
Picture of Times Tables Flash Cards, 1-12 Times Tables, Multiplication Flash Cards for Kids, Addition Flash Cards with 2 Dry Erase Pens

Times Tables Flash Cards, 1-12 Times Tables, Multiplication Flash Cards for Kids, Addition Flash Cards with 2 Dry Erase Pens

SizeOne Size
MaterialPaper
Educational objectiveMath Skills
ColourA

About this item:

  • Interactive Learning: The multiplication chart uses double-sided printing technology, with questions on one side and answers on the other,it's convenient to check for children after answering questions. Simply wipe it with the pens to eliminate the answer, making it easy for subsequent modification and reuse.
  • Add and Mul: Our math learning cards have Addition flash cards and Times table flash cards, you can choose the appropriate learning card according to your child's situation, ideal for teaching, reviewing, and practicing in the classroom, home and anywhere.
  • Waterproof Material: Multiplication flash card is made from thickened cardboard, times table flash cards are covered with a bright film on the surface, waterproof and reliable, not easy to tear, double-sided and does not fade, safe for baby and kids.
  • Practicality: Math flashcards can be a useful tool for practicing multiplication, that will help honing basic multiplication, ideal for 1st to 3rd grade to reinforce calculation skills, a great math facts flash cards.
  • Easy to Carry and Store: These multiplication chart are about 7x18 cm/2.8x7 inches in size and come with a binder ring facilitate convenient organization, easy to store and make sure you don't lose a card.
£11.99 ex. VAT £5.99 ex. VAT
In stock
Picture of Edx Education 100-Piece Math Cubes Set, Interlocking Counting Blocks

Edx Education 100-Piece Math Cubes Set, Interlocking Counting Blocks

ColourMulticoloured
ThemeEducation
MaterialPlastic

About This Item:

✅ 100-Piece Set – Colorful, interlocking cubes for math learning
✅ Hands-On Learning – Helps with counting, patterns & arithmetic
✅ STEM & Montessori-Based – Encourages logical thinking & creativity
✅ Child-Safe & Durable – Made from high-quality, non-toxic plastic
✅ Ideal for Ages 3+ – Perfect for homeschooling, classrooms & play

£21.99 ex. VAT From £6.99 ex. VAT
In stock
Picture of 8-Piece Geometry Compass & Ruler Set , School Math Kit with Protractor, Pencil & More (Black)

8-Piece Geometry Compass & Ruler Set , School Math Kit with Protractor, Pencil & More (Black)

ColourBlack 
Type:School Geometry Set
MaterialPlastic

About This Item:

✅ 8-Piece Complete Set – Includes compass, protractor, ruler, set squares, pencil, eraser & sharpener
✅ Durable & Precise – High-quality plastic & metal for accurate measurements
✅ Portable & Organized – Comes in a compact storage case for easy carrying
✅ Ideal for Students & Professionals – Perfect for school, exams & technical drawing
✅ Sleek Black Design – Stylish and professional look for all users

£23.99 ex. VAT From £3.99 ex. VAT
In stock
Picture of Clever Fox Undated Teacher Planner , A5 Lesson & School Year Organizer (Black, Hardcover)

Clever Fox Undated Teacher Planner , A5 Lesson & School Year Organizer (Black, Hardcover)

ColourBlack
Cover materialFaux Leather
Calendar TypeNon Dated
Target audienceTeacher
Sheet sizeA5

About This Item:

  • Undated & Flexible – Start anytime, perfect for custom lesson planning
  • A5 Hardcover Design – Compact, durable & easy to carry
  • Weekly & Monthly Layouts – Organize schedules & student progress
  • Classroom Management Tools – Includes grading, attendance & notes sections
  • Ideal for Teachers & Homeschoolers – Perfect for structured academic planning
£21.99 ex. VAT From £3.99 ex. VAT
In stock

Premium Mixed-Sized White Self-Seal Envelopes – 45 Pack

Ehance your mailing experience with our 45-pack mixed-sized white envelopes. Designed for both personal and professional use, these 100 GSM self-seal envelopes ensure durability, security, and convenience. The pack includes DL, C5, and C4 envelopes with a tamper-proof seal and security tint, making it ideal for multiple mailing needs.

Key Benefits:

  • Mixed sizes for versatility – comes in DL, C5, and C4 sizes to accommodate different documents.
  • Strong & durable – made with 100 GSM premium paper for added strength.
  • Self-sealing adhesive strip – no licking or moistening required; just peel and seal.
  • Security tinted – blue printed inner pattern protects sensitive information.
  • Multipurpose use – suitable for personal, business, and ecommerce mailing needs.

Why Choose Premium Mixed-Sized White Envelopes?

  • Comprehensive pack – includes 45 envelopes in three different sizes.
  • Tamper-proof closure – ensures confidentiality with a reliable self-seal strip.
  • Professional & elegant – crisp white envelopes ideal for formal and casual use.
  • Bonus envelope opener – comes with a handy letter opener in a random color.
  • Eco-friendly & recyclable – made from high-quality, sustainable paper.

Applications:

  • Sending greeting cards, invitations, and business letters.
  • Mailing documents, invoices, and legal papers.
  • Organizing and storing photos, files, and collectibles.
  • Suitable for offices, ecommerce businesses, and personal use.

Specifications:

FeatureDetails
MaterialPremium Paper
Paper Weight100 GSM
Envelope SizesDL (110x220mm), C5 (229x162mm), C4 (229x324mm)
Closure TypeSelf-Seal Adhesive Strip
Security TintYes
Pack Includes15 DL, 15 C5, 15 C4 Envelopes + 1 Envelope Opener
ColorWhite
UseMailing, Office, Ecommerce, Invitations

FAQs:

Q: Are these envelopes strong enough for bulk mailing?
A: Yes, the 100 GSM thick paper ensures durability for bulk mailing needs.

Q: Is the adhesive strip strong?
A: Yes, the self-seal strip provides a secure and tamper-proof closure.

Q: What sizes are included in the pack?
A: The pack includes 15 DL (110x220mm), 15 C5 (229x162mm), and 15 C4 (229x324mm) envelopes.

Q: Do these envelopes have a security tint?
A: Yes, they feature a blue inner pattern to protect sensitive content.

Q: Can I use these for wedding invitations?
A: Absolutely! These envelopes are ideal for invitations, greeting cards, and special events.

  • Only registered users can write reviews
*
*
*
*
*

Premium Mixed-Sized White Self-Seal Envelopes – 45 Pack

Ehance your mailing experience with our 45-pack mixed-sized white envelopes. Designed for both personal and professional use, these 100 GSM self-seal envelopes ensure durability, security, and convenience. The pack includes DL, C5, and C4 envelopes with a tamper-proof seal and security tint, making it ideal for multiple mailing needs.

Key Benefits:

  • Mixed sizes for versatility – comes in DL, C5, and C4 sizes to accommodate different documents.
  • Strong & durable – made with 100 GSM premium paper for added strength.
  • Self-sealing adhesive strip – no licking or moistening required; just peel and seal.
  • Security tinted – blue printed inner pattern protects sensitive information.
  • Multipurpose use – suitable for personal, business, and ecommerce mailing needs.

Why Choose Premium Mixed-Sized White Envelopes?

  • Comprehensive pack – includes 45 envelopes in three different sizes.
  • Tamper-proof closure – ensures confidentiality with a reliable self-seal strip.
  • Professional & elegant – crisp white envelopes ideal for formal and casual use.
  • Bonus envelope opener – comes with a handy letter opener in a random color.
  • Eco-friendly & recyclable – made from high-quality, sustainable paper.

Applications:

  • Sending greeting cards, invitations, and business letters.
  • Mailing documents, invoices, and legal papers.
  • Organizing and storing photos, files, and collectibles.
  • Suitable for offices, ecommerce businesses, and personal use.

Specifications:

FeatureDetails
MaterialPremium Paper
Paper Weight100 GSM
Envelope SizesDL (110x220mm), C5 (229x162mm), C4 (229x324mm)
Closure TypeSelf-Seal Adhesive Strip
Security TintYes
Pack Includes15 DL, 15 C5, 15 C4 Envelopes + 1 Envelope Opener
ColorWhite
UseMailing, Office, Ecommerce, Invitations

FAQs:

Q: Are these envelopes strong enough for bulk mailing?
A: Yes, the 100 GSM thick paper ensures durability for bulk mailing needs.

Q: Is the adhesive strip strong?
A: Yes, the self-seal strip provides a secure and tamper-proof closure.

Q: What sizes are included in the pack?
A: The pack includes 15 DL (110x220mm), 15 C5 (229x162mm), and 15 C4 (229x324mm) envelopes.

Q: Do these envelopes have a security tint?
A: Yes, they feature a blue inner pattern to protect sensitive content.

Q: Can I use these for wedding invitations?
A: Absolutely! These envelopes are ideal for invitations, greeting cards, and special events.

Product tags
Related Products
Picture of Padded Envelopes A5 Padded Bubble Envelopes Bags Postal Wrap Envelope

Padded Envelopes A5 Padded Bubble Envelopes Bags Postal Wrap Envelope

Colour:20pk White
Closure type:Self-Seal
Material:Plastic
Number of items:20

About this item:

  • Easy to use with excellent label adhesion. Write on easily with any pen, no need for anything special !
  • Pack your items fast with these peel and seal bags. Peel off the protective strip to reveal the adhesion and press down to seal envelope
  • Our padded envelopes are perfect for delivery and logistics for small accessories like cosmetics, jewelry, gadgets etc.
  • Lightweight yet superb padding for all goods, provided excellent protection against crushing
£29.99 ex. VAT From £11.19 ex. VAT
In stock
Picture of Premium Cash Gift Envelopes (Pack of 25) - Assorted Colours Self-Adhesive

Premium Cash Gift Envelopes (Pack of 25) - Assorted Colours Self-Adhesive

Colour:Gold on White Red Blue Grey Black
Closure type:Self-Seal
Occasion:Baptism, Christmas, Wedding, Birthday, Shagun
Material:Cardstock

About this item:

  • ELEGANT - Fancy GOLD CONFETTI design that is neutral but elegant on 5 colours - making it suitable for all occassions - birthdays - anniversaries - weddings- christenings - diwali - bandi shor divas - gurpurab - easter - new year and more!
  • EASY TO WRITE ON! - unlike other fancy envelopes these have been coated in a way that still allows for easy writing, so you can personalise it easily as you wish
  • SELF ADHESIVE! Finally a fancy envelope that you can seal easily without ruining the style. Simply peel the paper off the double sided tape, and close to seal.
  • DESIGNED TO GIFT MONEY - made to measure for UK currency. Can still fit credit card sized cards if you are gifting a gift card or vouchers.
  • ALL ONE DESIGN - this pack is all one design on multiple colours - unlike other items on the market, you know exactly what to expect when you order from us!
  • HIGH QUALITY - sturdy card, with a neat finish and no regional smells.
£34.99 ex. VAT From £12.99 ex. VAT
In stock
Picture of 125 Mixed Grey Plastic Mailing Mail Post Postage Bags Assorted Sizes Packaging Poly Postal mailers

125 Mixed Grey Plastic Mailing Mail Post Postage Bags Assorted Sizes Packaging Poly Postal mailers

MaterialPlastic
ColourGrey
Unit count125 count
Style‎Poly

About this item:

  • Pack of 125 durable plastic mailing bags in assorted sizes for varied packaging needs

  • Grey opaque design ensures privacy and professional presentation

  • Water-resistant & tear-proof material for reliable shipping

  • Self-seal adhesive strip for quick and secure closure

  • Perfect for eCommerce, retail, home, and office postage

  • Lightweight and cost-effective for reducing postage costs

  •  Suitable for clothing, documents, accessories, and soft items

£16.99 ex. VAT £8.99 ex. VAT
In stock
Picture of 125 Assorted Mixed Pink Mailing Poly Postal Self Seal Bags

125 Assorted Mixed Pink Mailing Poly Postal Self Seal Bags

ColourPink
Closure typeSelf-Seal
MaterialPlastic
Number of items125

About this item:

  • These Opaque Mailing bags incorporate a permanent self-seal closure and are made from an opaque 60 micron film. Our posting bags have a self-adhesive strong closure. These air sealed postage bags are water and dirt resistant and made to secure the inside and outside.
  • Safe and Secure Package Bags:- These plastic mailers have a sticky strip for easy closure. Once sealed, these bags are very hard to open allowing your items to arrive safely without risk of opening or tampering.
  • Small to Large Mailing bags 4.5 x 7 Inch / 6 x 9 Inch / 9 x 12 Inch / 10 x 14 Inch / 12 X 16 INCH. Parcel bags for posting Mailing Packaging and more
  • Plastic envelopes for posting:- Small to Large postage bags are very light weight and sturdy. You can use its full size or put something smaller inside and wrap the excess before sealing.
  • These Plastic Postage Bags can be used for any Courier or sealed Airtight storage Purpose, you will get these bags in five different sizes, ideal for packing items of all types, shapes and sizes. The self-seal lip makes the parcel air tight and water resistant for personal and business use.
£14.99 ex. VAT £7.99 ex. VAT
In stock
Picture of 60 Mixed Size Self-Seal Mailer Bags | Tamper-Proof Plastic Packaging for Mailing, Postage, Shipping & Delivery | Grey (4 Sizes | Small to Large | 15 each)

60 Mixed Size Self-Seal Mailer Bags | Tamper-Proof Plastic Packaging for Mailing, Postage, Shipping & Delivery | Grey (4 Sizes | Small to Large | 15 each)

MaterialPlastic
Product dimensions10L x 10W millimetres
ColourGrey
Item weight0.46 Kilograms

About This Item:

  • 4 Sizes: 6x9 inches, 9x12 inches, 10x14 inches, and 12x16 inches.
  • Self-Adhesive Closure – Peel-and-seal for easy packing.
  • Waterproof & Oilproof – Protects contents from moisture and damage.
  • Durable – Crafted from high-quality polythene material.
  • Versatile – Great for clothes, electronics, decor, and more.
£6.99 ex. VAT £3.99 ex. VAT
In stock
Picture of 110 x 220 mm 90 gsm Self Seal Wallet Envelopes (13882/100 PR) White - 100 Count ( Pack of 1)

110 x 220 mm 90 gsm Self Seal Wallet Envelopes (13882/100 PR) White - 100 Count ( Pack of 1)

ColourWhite
Closure typeSelf-Seal
OccasionOffice
MaterialPaper

About This Item:

  • Self-Seal Closure – Easy to seal without glue or water.
  • Security Opaque – Ensures privacy and confidentiality.
  • 90 gsm Paper – Durable, sturdy, and premium-quality paper.
  • Ideal for Office Use – Perfect for mailing letters, invoices, and more.
  • Pack of 100 – Plenty of envelopes for all your mailing needs.
£12.99 ex. VAT £6.99 ex. VAT
In stock
Picture of A3 A4 A5 A6 Gold/White Bubble Padded Envelopes Peal & Seal, Ideal for Mailing Goods | Packaging Bags, Gold, A6(100mm x 165mm), Pack of 10

A3 A4 A5 A6 Gold/White Bubble Padded Envelopes Peal & Seal, Ideal for Mailing Goods | Packaging Bags, Gold, A6(100mm x 165mm), Pack of 10

ColourGold
Closure typeSelf-Seal
OccasionMailing Goods
MaterialPaper

About This Item:

  • Premium Gold Design – Elegant and professional appearance for shipments.
  • Bubble Padded Protection – Keeps items safe from damage.
  • Peel & Seal Closure – Quick, easy, and secure sealing.
  • Lightweight & Durable – Reduces shipping costs while ensuring protection.
  • Pack of 10 – Ideal for businesses, offices, and personal use.
£8.99 ex. VAT £4.99 ex. VAT
In stock
Secure Payments
30 Days Money Back Guaranteed
100% Satisfaction Guaranteed
Easy Returns
Find us also on

Please contact the Customer Services for returning address.
For all question about orders or general enquires please contact us:
BUYINUK
Office 4077wri 58 Peregrine Road, Hainault
Ilford, Essex IG6 3SZ, United Kingdom
sales@buyinuk.co.uk
+44 747 720 4634

Information
Customer service
Copyright © 2025 Buy In Uk. All rights reserved.