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Postal Boxes

We have a large range of postal boxes available in colours from kraft brown to black and white, including two-piece rigid boxes and one-piece corrugated cardboard flat packs. These come in sizes from small, medium, and large, with Royal Mail large letter boxes, book wrap mailers, and flower boxes available too.

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Small Postal BoxesSmall Postal Boxes
Medium Postal BoxesMedium Postal Boxes
Large Postal BoxesLarge Postal Boxes
Postal Boxes to fit A4Postal Boxes to fit A4
Postal Boxes to fit A5Postal Boxes to fit A5
Postal Boxes to fit A6Postal Boxes to fit A6
Flat Packed Postal BoxesFlat Packed Postal Boxes
Rigid Two-Piece Postal BoxesRigid Two-Piece Postal Boxes
Pizza Box Style Postal BoxesPizza Box Style Postal Boxes
Book Wrap MailersBook Wrap Mailers
Packing ItemsPacking Items
White Postal BoxesWhite Postal Boxes
Black Postal BoxesBlack Postal Boxes
Kraft Postal BoxesKraft Postal Boxes
Recycled Cardboard EnvelopesRecycled Cardboard Envelopes
Recycled Postal BagsRecycled Postal Bags
Flexi-Hex® Postal Sleeves Flexi-Hex® Postal Sleeves
Recycled Jiffy BagsRecycled Jiffy Bags
Subscription Postal BoxesSubscription Postal Boxes
Flower BoxesFlower Boxes
Paper Mailing BagsPaper Mailing Bags
Postal Boxes with Coloured LiningPostal Boxes with Coloured Lining
Royal Mail Large Letter BoxesRoyal Mail Large Letter Boxes

147 products

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  1. 1 Piece A6 Mailing Gift Box Kraft Kraft 1-Piece A6 Corrugated Postal Box
    Brand OnlineNo InsertBestseller Kraft 1-Piece A6 Corrugated Postal Box
    FMKRA6 178 x 131 x 55mm
    From £0.40£0.33
    £0.60 £0.50
  2. Black 1-Piece A6 Corrugated Postal Box Black 1-Piece A6 Corrugated Postal Box
    Brand Online Black 1-Piece A6 Corrugated Postal Box
    FMBLA6 178 x 131 x 55mm
    From £0.74£0.62
    £0.91 £0.76
  3. 1 Piece Thin A6 Mailing Gift Box Kraft Kraft 1-Piece Thin A6 Corrugated Postal Gift Box
    Brand OnlineNo Insert Kraft 1-Piece Thin A6 Corrugated Postal Gift Box
    FMA6KR22 178 x 131 x 22mm
    From £0.34£0.28
    £0.54 £0.45
  4. Black 1-Piece Thin A6 Corrugated Postal Box Black 1-Piece Thin A6 Corrugated Postal Box
    Brand Online Black 1-Piece Thin A6 Corrugated Postal Box
    FMA6BL22 178 x 131 x 22mm
    From £0.56£0.47
    £0.71 £0.59
  5. 1 Piece A5 Mailing Gift Box Kraft Kraft 1-Piece A5 Corrugated Postal Box
    Brand OnlineNo InsertBestseller Kraft 1-Piece A5 Corrugated Postal Box
    FMKRA5 244 x 180 x 55mm
    From £0.58£0.48
    £0.92 £0.77
  6. Black 1-Piece A5 Corrugated Postal Box Black 1-Piece A5 Corrugated Postal Box
    Brand Online Black 1-Piece A5 Corrugated Postal Box
    FMBLA5 244 x 180 x 55mm
    From £1.16£0.97
    £1.33 £1.11
  7. Slim A5 Corrugated Flat Mailing Box Slim A5 Corrugated Flat Mailing Box
    Brand Online Slim A5 Corrugated Flat Mailing Box
    FMA5KR22 238 x 180 x 22mm
    From £0.54£0.45
    £0.86 £0.72
  8. Slim A5 Flat Corrugated Mailing Box Slim A5 Flat Corrugated Mailing Box
    Brand Online Slim A5 Flat Corrugated Mailing Box
    FMA5BL22 238 x 180 x 22mm
    From £1.01£0.84
    £1.16 £0.97
  9. 1 Piece A4 Mailing Gift Box Kraft Kraft 1-Piece A4 Corrugated Postal Box
    Brand OnlineNo Insert Kraft 1-Piece A4 Corrugated Postal Box
    FMKRA4 322 x 228 x 55mm
    From £0.83£0.69
    £1.31 £1.09
  10. 1 Piece Thin A4 Mailing Gift Box Kraft Slim A4 Corrugated Flat Mailing Box
    Brand Online Slim A4 Corrugated Flat Mailing Box
    FMA4KR22 322 x 228 x 22mm
    From £0.78£0.65
    £1.18 £0.98
  11. Slim A4 Flat Mailing Box Slim A4 Flat Corrugated Mailing Box
    Brand Online Slim A4 Flat Corrugated Mailing Box
    FMA4BL22 322 x 228 x 22mm
    From £1.09£0.91
    £1.42 £1.18
  12. Mailing Box For Deep Snap Shut Box - 300 x 235 x 122mm Kraft
    Brand OnlineNo Insert Kraft Brown Postal Box for Mailing Deep Magnetic Box
    FMKR22 300 x 235 x 122mm
    From £0.91£0.76
    £1.10 £0.92
  13. Kraft Brown Postal Box for Mailing Large Magnetic Box
    Brand Online Kraft Brown Postal Box for Mailing Large Magnetic Box
    FMKR40 420 x 315 x 116mm
    From £1.45£1.21
    £1.85 £1.54
  14. Mailing Box For Medium Snap Shut Box - 218 X 175 X 90mm Kraft
    Brand OnlineNo Insert Kraft Brown Postal Box for Mailing Medium Magnetic Box
    FMKR16 218 x 175 x 90mm
    From £0.71£0.59
    £0.83 £0.69
  15. Mailing Box For Small Snap Shut Box - 158 X 135 X 75mm Kraft
    Brand OnlineNo Insert Kraft Brown Postal Box for Mailing Small Magnetic Box
    FMKR12 160 x 135 x 78mm
    From £0.41£0.34
    £0.48 £0.40
  16. White Mailing Box For 320 X 238 X 68mm White White Corrugated Postal Box 310mm length
    Brand OnlineNo Insert White Corrugated Postal Box 310mm length
    FMWH07 310 x 237 x 62mm
    From £0.54£0.45
    £0.83 £0.69
  17. White Mailing Box For 178 X 144 X 56mm White White Corrugated Postal Box 178mm length
    Brand OnlineNo Insert White Corrugated Postal Box 178mm length
    FMWH08 178 x 144 x 56mm
    From £0.48£0.40
    £0.74 £0.62
  18. White Mailing Box For 154 X 150 X 60mm White White Corrugated Postal Box 154mm length
    Brand OnlineNo Insert White Corrugated Postal Box 154mm length
    FMWH03 154 x 150 x 60mm
    From £0.43£0.36
    £0.68 £0.57
  19. White Mailing Box For 125 X 114 X 85mm White White Corrugated Postal Box 125mm length
    Brand OnlineNo Insert White Corrugated Postal Box 125mm length
    FMWH02 125 x 103 x 80mm
    From £0.43£0.36
    £0.70 £0.58
  20. White Mailing Box For 103 X 85 X 60mm White White Corrugated Postal Box 103mm length
    Brand OnlineNo Insert White Corrugated Postal Box 103mm length
    FMWH01 103 x 85 x 60mm
    From £0.37£0.31
    £0.55 £0.46
  21. Corrugated Kraft Box in a pack of 10 - 330 x 220 x 150mm E-Commerce Corrugated Kraft Boxes 330mm length
    E-Commerce Corrugated Kraft Boxes 330mm length
    ECKR33 330 x 220 x 150mm
    From £1.79£1.49
    £2.05 £1.71
  22. Kraft Flower Letterbox Mailing Box Reversible Flower Letterbox Postal Mailing Box
    No Insert Reversible Flower Letterbox Postal Mailing Box
    FLKR33 590 x 175 x 34mm
    £1.01 £0.84
  23. One-Piece Cube Mailing Box Kraft
    Brand OnlineNo Insert Kraft 1-Piece Cube Postal Box
    FMKRCU 127 x 127 x 127mm
    From £0.25£0.21
    £0.41 £0.34
  24. kraft corrugated cardboard wrap mailer with perforated tab opening and strong self adhesive seal Kraft Perforated Wrap Large Mailing Box with Tear Strip
    Kraft Perforated Wrap Large Mailing Box with Tear Strip
    FMKR64 347 x 255 x 47mm
    From £0.80£0.67
    £0.96 £0.80
  25. kraft corrugated cardboard wrap mailer with perforated tab opening and strong self adhesive seal Kraft Perforated Wrap Medium Mailing Box with Tear Strip
    Kraft Perforated Wrap Medium Mailing Box with Tear Strip
    FMKR58 317 x 211 x 67mm
    From £0.66£0.55
    £0.83 £0.69
  26. kraft corrugated cardboard wrap mailer with perforated tab opening and strong self adhesive seal Kraft Perforated Wrap Small Mailing Box with Tear Strip
    Kraft Perforated Wrap Small Mailing Box with Tear Strip
    FMKR54 257 x 165 x 45mm
    From £0.43£0.36
    £0.71 £0.59
  27. Lilac Deep A6 Mailing Box Lilac Deep 1-Piece A6 Mailing Gift Box
    Brand meNo Insert Lilac Deep 1-Piece A6 Mailing Gift Box
    FMLIA6 178 x 131 x 55mm
    £1.19 £0.99
  28. Rose Quartz Deep 1 Piece A6 Mailing Box Rose Quartz Deep 1-Piece A6 Mailing Gift Box
    Brand meNo Insert Rose Quartz Deep 1-Piece A6 Mailing Gift Box
    FMRQA6 178 x 131 x 55mm
    £1.19 £0.99
  29. Sage Green Deep 1 Piece A6 Mailing Box Sage Green Deep 1-Piece A6 Mailing Gift Box
    Brand meNo Insert Sage Green Deep 1-Piece A6 Mailing Gift Box
    FMSGA6 178 x 131 x 55mm
    £1.19 £0.99
  30. Radiant Red Deep 1 Piece A6 Mailing Box Radiant Red Deep 1-Piece A6 Mailing Gift Box
    Brand meNo Insert Radiant Red Deep 1-Piece A6 Mailing Gift Box
    FMRRA6 178 x 131 x 55mm
    £1.19 £0.99
  31. Apricot Crush Orange Mailing Box Apricot Crush Orange Deep 1-Piece A6 Mailing Gift Box
    Brand meNo Insert Apricot Crush Orange Deep 1-Piece A6 Mailing Gift Box
    FMACA6 178 x 131 x 55mm
    £1.19 £0.99
  32. Lilac 1 Piece A6 Mailing Box Lilac 1-Piece A6 Mailing Gift Box
    Brand me Lilac 1-Piece A6 Mailing Gift Box
    FMA6LI22 178 x 131 x 22mm
    £0.76 £0.63
  33. Rose Quartz 1 Piece A6 Mailing Box Rose Quartz 1-Piece A6 Mailing Gift Box
    Brand meNo Insert Rose Quartz 1-Piece A6 Mailing Gift Box
    FMA6RQ22 178 x 131 x 22mm
    £0.76 £0.63
  34. Sage Green 1 Piece A6 Mailing Box Sage Green 1-Piece A6 Mailing Gift Box
    Brand meNo Insert Sage Green 1-Piece A6 Mailing Gift Box
    FMA6SG22 178 x 131 x 22mm
    £0.76 £0.63
  35. Radiant Red 1 Piece A6 Mailing Box Radiant Red 1-Piece A6 Mailing Gift Box
    Brand meNo Insert Radiant Red 1-Piece A6 Mailing Gift Box
    FMA6RR22 178 x 131 x 22mm
    £0.76 £0.63
  36. White Flat Packed Plain Mug Gift Box White Flat Packed Micro Corrugated Mug Gift Box
    Brand me White Flat Packed Micro Corrugated Mug Gift Box
    FCWHMU 112 x 112 x 112mm
    £1.14 £0.95
  37. Kraft Flat Packed Plain Mug Gift Box Kraft Flat Packed Micro Corrugated Mug Gift Box
    Brand me Kraft Flat Packed Micro Corrugated Mug Gift Box
    FCKRMU 112 x 112 x 112mm
    £1.14 £0.95
  38. Black Postal Mail Box Black 1-Piece Tabbed Corrugated Postal Box
    Black 1-Piece Tabbed Corrugated Postal Box
    FMBL07 310 x 237 x 62mm
    From £1.55£1.29
    £1.86 £1.55
  39. Black Postal Mailer Box | Black Slim 1-Piece Flat Black Corrugated Postal Box
    Slim 1-Piece Flat Black Corrugated Postal Box
    FMBL09 322 x 180 x 20mm
    From £0.92£0.77
    £1.14 £0.95
  40. Black One Piece Matchbox Postal Box |Closed Black 1-Piece Matchbox Corrugated Postal Box
    Black 1-Piece Matchbox Corrugated Postal Box
    FMBL11 139 x 139 x 20mm
    From £0.86£0.72
    £1.02 £0.85
  41. Large Rigid 2 Piece Postal Box | Gift Box Kraft Brown Kraft Rigid 2-Piece Postal Box / Gift Box 210mm length
    Brand Online Brown Kraft Rigid 2-Piece Postal Box / Gift Box 210mm length
    RMKR26 210 x 160 x 70mm
    From £2.02£1.68
    £2.39 £1.99
  42. Rigid 2 Piece Rectangular Postal Box | Gift Box Kraft Brown Kraft Rigid 2-Piece Postal Box / Gift Box 140mm length
    Brand Online Brown Kraft Rigid 2-Piece Postal Box / Gift Box 140mm length
    RMKR4B 140 x 102 x 50mm
    From £1.87£1.56
    £2.60 £2.17
  43. Rigid 2 Piece Rectangular Postal Box | Gift Box Kraft Brown Kraft Rigid 2-Piece Postal Box / Gift Box 145mm length
    Brand Online Brown Kraft Rigid 2-Piece Postal Box / Gift Box 145mm length
    RMKR5B 145 x 102 x 64mm
    From £1.66£1.38
    £1.97 £1.64
  44. Rigid 2 Piece Rectangular Postal Box | Gift Box Kraft Brown Kraft Rigid 2-Piece Postal Box / Gift Box 152mm length
    Brand Online Brown Kraft Rigid 2-Piece Postal Box / Gift Box 152mm length
    RMKR8N 152 x 115 x 50mm
    From £1.74£1.45
    £2.42 £2.02

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We have a large range of postal boxes available in colours from kraft brown to black and white, including two-piece rigid boxes and one-piece corrugated cardboard flat packs. These come in sizes from small, medium, and large, with Royal Mail large letter boxes, book wrap mailers, and flower boxes available too.

Postal Boxes - Recyclable, Sustainable & Ready to Mail

At Tiny Box Company, we offer a wide range of postal boxes and mailing boxes for everything from personal parcels to high-volume business orders. Our collection includes flat pack and rigid styles in sizes including A6, A5, and A4 - including Royal Mail large letter boxes.

Made from eco-friendly materials, our boxes are strong, secure, and sustainable - ideal for eco-conscious individuals and businesses alike. Use them to ship everything from photographs and stationery to artwork, gifts, or corporate brochures.

What's corrugated cardboard? Quite simply, it's made up of three layers of board - two sheets covering the outside and one in the middle that has a rippled shape. This is what makes it so strong, which is why it's often used for mailing!

Read more here on selecting the perfect material for your gift/postal boxes.

Brighten up your packaging with colourful A6 mailing boxes or go classic with kraft brown and white finishes. For delicate items like books or flowers, explore our kraft mailers and flower letterboxes with circular hole cutouts.

They’re not just for shipping - our boxes are also great for storage, gift presentation, or keeping handmade items protected. And when space is limited, our flat pack options fold down neatly.

Need some help choosing the right postal box for your business? Check out our guide here!

Branded Postal Boxes

Add your logo with digital printing to make a lasting impression. Whether you need a few or are ordering in wholesale quantities, we offer flexible options for every business size.

Complete Packaging Solutions

Finish the look with our eco-friendly postal bags, kraft tape, shredded paper filler, and more packaging accessories - all designed to keep your products safe and stylish.

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