Top 9 Flat Packaging Boxes UK – Box Mailers

As an Amazon Associate I earn from qualifying purchases.


Pink, 20 Pack Small Shipping Boxes for Small Business Packaging Postal Mailing Corrugated Cardboard Box Colorful Flat Pack Gift Boxes 5.9x3.9x1.5 Inches

SYSI - Packaging - package include 20 pcs corrugated Box. Literature mailer box- 3 different sizes for your choice, meets most mailing and shipping carrier specifications, please choose the correct size accordingly to your products.

Ship in fashion- colorful hot-pink shipping Boxes will distinguish your brand from the competitions. All cartons ship and store flat to save space. When youi receive it just fold it directly, no tape or glue needed. Ship in style instead of shipping in a boring, plain box. Multiple usage- this pink box is perfect for packaging, biscuits, baby shower hostesses, toys, mailing shipping and gift giving small soaps, or other small items.

Perfect for small retailers, wedding party, classroom valentine’s / Day exchange party, birthday and a lot more. Sturdy & easy for use- single wall corrugated boxes are made of recyclable cardboard which is sturdy and durable for daily use.

2. Lightning

A4 Packaging Boxes for Flat Items. Postal & Storage Boxes for Books, DVDs & Flat Items. Book Boxes Sized 302x215mm Wraps Around All Flat Items Securely., Mailer Box/Book Packaging A4 x 25/Pk

Lightning - Rigid mailer box / book packaging for flat items – our book mailer box provides strong protective packaging, but dvds, not only for your books, brochures and flat items. The a4 book boxes are the ideal solution for posting your books and other flat items. Our book wrap has a smooth Kraft surface which are easy to stick labels on / write on.

Recycable book boxes – our book wrap boxes are manufacture from 400gsm smooth corrugated cardboard with are recyclable and environmentally friendly. Our boxes for books are pre-creased so you can easily adjust the height up to 80mm. 25 a4 packaging boxes supplied per pack. Time efficient and cost effective book mailers – our box mailers are easy to use, and allows you to pack several items of the same size together, without using extra tape, glue or wrapping paper helping you save money and time! The book packaging wraps snuggly around contents and is Royal Mail small parcel size 2kg limit.

Proffesional book packaging- whether it be a book, dvd or any flat items our book packaging will provide an attractive professional postal packaging solution for all your flat items. Whilst the outer flap of the book wrap is secured with a high tack tamperproof peel-&-seal adhesive strip. Reliable book wrap- our easy to use box mailers with internal flaps wrap around contents securely and keep them in place. Our durable book mailers can be reused if sealed with packing tape. They have a secure high tack peel & seal closure and a user-friendly opening ripper strip.
Part NumberBM-A4

3. Triplast

Triplast C6 160 x 110 x 20 mm White PIP Cardboard Large Letter Postal Box for Royal Mail Pack of 25

Triplast - 125 wk/t - high quality 0427 Style. White pip die cut and fits within Royal Mail large letter guidelines. Easy to construct with fold over ends and ear lock lids. Model number: PIPC6. Dimensions: 160x110x20mm 6. 3"x4. 3"x08".
Height2.1 cm (0.83 Inches)
Length11.5 cm (4.53 Inches)
Weight0.02 kg (0.06 Pounds)
Width18 cm (7.09 Inches)
Part NumberPIPC6

4. SR Mailing

50X C4 A4 Size Box Large Letter Strong Cardboard Shipping Mailing Postal Pip, LGELETBOXC4005

SR Mailing - Brown c4/a4 pricing in proportion pip cardboard postal boxes. A4/c4: external size: 345mmm x 240mm x 22mm 13. 6" x 9. 5" x 08" - large Letter qualifying. Quick and easy to assemble, sealable with clear/brown tape. Delivered flat-packed, securely wrapped. Made from a hard 1. 2mm thick single wall cardboard.
BrandSR Mailing
ManufacturerSR Mailing
Part NumberLGELETBOXC4005

5. Packaging2Buy

305x228x228mm. 25/Pack. Strong Corrugated Biodegradable Packaging Made from 100% Recycled Material. Economical Flat Packed Cardboard Boxes, Ideal Postage/Storage Boxes., Eco-Friendly Cardboard Boxes

Packaging2Buy - Low-cost sustainable packaging ideal as postal or storage boxes. Sustainable packaging with a plus - these eco cardboard boxes are single wall, so reducing the amount of material used in production and the CO2 emissions from manufacturing/distribution and yet are as strong as a double wall box. Not only do they cost less than double wall boxes, construction, but reinforced, it also mean less material for recycling.

Ideal as storage boxes or postal boxes. High quality recyclable / biodegradable packaging - our eco friendly cardboard boxes are fresh, clean and robust, with integral flaps on top for taping shut and a smooth outer for marking or labelling. Reliable cheap packing boxes - this flat packed eco friendly packaging won’t let you down, thanks to the cleverly designed reinforced single wall fluted cardboard that makes the boxes nearly as strong as standard double wall boxes – but costing less. Flat packed cardboard boxes – with the choice of two depths, easy to assemble and convenient to store.

They are made from 100% recycled material, can be recycled, reused or are biodegradable. Eco friendly packaging boxes - our recyclable cardboard boxes are strong enough for reuse and give you a genuine eco-friendly packaging option. Reinforced single wall corrugated cardboard boxes designed to be as strong as double wall cardboard boxes but using fewer resources. Versatile eco friendly cardboard boxes - biodegradable packaging made from 100% recycled material. Delivered flat packed they are easy to use, and conveniently sized 305x228x228mm 12x9x9ins.
Height22.8 cm (8.98 Inches)
Length30.5 cm (12.01 Inches)
Width22.8 cm (8.98 Inches)
Part NumberLOOP10

6. RelianceUK

RelianceUK Smash Proof Postal Small Cardboard Shipping Strong Boxes 11.5 x 8 x 10cm Triple Side Walls Business Packaging White Parcel Box for Mailing 10oz and 11oz Mugs Candles Gift Items Pack Of 25

RelianceUK - Great for packing 10oz and 11oz mugs, candles, cups and toys. It's as simple as that. Our smash proof boxes are made of recycled corrugated cardboard, which is lightweight but sturdy ensuring your stuff safety. Our smash proof mug boxes are supplied in packs of 25 and flat packed. Simply build the box, our smash proof boxes take up very little space, pop the item in and close. Reinforced with triple thickness sides for providing ultimate protection to your item. Unlike the other parcel boxes, they are cost effective, easy to fold and do not require any additional inner packaging.
Height10 cm (3.94 Inches)
Length50 cm (19.69 Inches)
Weight2.6 kg (5.73 Pounds)
Width32 cm (12.6 Inches)

7. 5 x small cardboard mailing packaging boxes, Size 6x4x4" - Lightweight, to save adding on to your postage costs ~35g each. 6" x 4" x 4" / 152 x 102 x 102 approx. Great for packing small items, no need to pack out with excessive paper. Single wall 2-3mm cardboard. Small packaging mailing box Pack of 5.


Storing or Gift Pack of 10, 10x10x2cm Royal Mail Large Letter PiP Postal Boxes for Posting, Brown Packaging Mailing Boxes for Business, Corrugated Cardboard Shipping Boxes

STRBOXONG - Outer size: 10cmx10cmx2cm, inner size when made up: 9cmx9. 7cmx1. 7cm. Made from strong 32ect-e single wall corrugated kraft cardboard which is Eco-friendly, recyclable and sturdy for daily use.

Package ships flat packed for easy storage, and are easy to assemble in seconds – no tapes, glue or staplers are needed. 100% satisfaction: please contact us via e-mail for any case, we guarantee our customers 100% money back in 90 days. Pack, mail, or store small items in these cartons, Ship, they make the perfect box for those little products or gifts that need to be sent out or stored until ready to use. Qualifies for royal Mail Large Letter postage if under 750g.
Height2 cm (0.79 Inches)
Length10 cm (3.94 Inches)
Weight0.02 kg (0.04 Pounds)
Width10 cm (3.94 Inches)
Part NumberBrown Box Mailer-100×100×20mm
ModelSmall Parcel Box (4×4×0.8 Inches)

9. Lightning packaging supplies

White Postal Boxes, 153x127x51mm 6x5x2ins. 25 / Pack. Eco Friendly Flat Royal Mail Small Parcel Size Cardboard Postage Boxes. Strong Cartons with Self-Lock Tuck-In Flaps & Triple Thick Sides. Flatpacked & Easy to Assemble. Versatile Plain Mailing Boxes. Fast Delivery

Lightning packaging supplies - Offering added protection - made from durable and strong recycled cardboard, our flat postage boxes are further reinforced by triple thickness sides once assembled. 100% recyclable.

Cut down on packing time - our white postal boxes are quick to put together and you don't need tape or glue to close them thanks to the carton's tuck-in flaps. Cost-effective mailing solution - These white postal boxes provide versatile packaging for many different items and save postage by conforming to Royal Mail small parcel size. Quick to address or label - our plain white mailing boxes have a convenient surface: you can write on them with a marker pen or stick on an adhesive label. Gives your parcels that professional touch - Recipients will be impressed by the overall quality and smart white colour of our cardboard postal boxes.
BrandLightning packaging supplies
Height5.1 cm (2.01 Inches)
Length15.3 cm (6.02 Inches)
Weight0.07 kg (0.15 Pounds)
Width12.7 cm (5 Inches)
Part NumberLGB2