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Flat Packed Postal Boxes

Our flat-pack postal boxes include a range of sizes and styles to suit all your product needs, from classic flat-pack boxes to pizza-style boxes and book wrap mailers...

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56 products

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  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. Black 1-Piece A4 Postal Box Black 1-Piece A4 Corrugated Postal Box
    Brand Online Black 1-Piece A4 Corrugated Postal Box
    FMBLA4 322 x 228 x 55mm
    From £1.76£1.47
    £2.03 £1.69
  12. 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
  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. 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
  15. 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
  16. 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
  17. 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
  18. Kraft Earring Holder with earrings Earring Holder Kraft Mailer
    Brand me Earring Holder Kraft Mailer
    EMKR65 65 x 65 x 12mm
    £0.23 £0.19
  19. Earrings shown in white earring holder Earring Holder White Mailer
    Brand me Earring Holder White Mailer
    EMWH65 65 x 65 x 12mm
    £0.23 £0.19
  20. Kraft Bottle Postal Box for Mailing Kraft Bottle Postal Box for Mailing
    Kraft Bottle Postal Box for Mailing
    FMKR33 345 x 105 x 105mm
    £0.60 £0.50
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. 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
  27. 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
  28. 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
  29. 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
  30. 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
  31. Apricot Crush Orange Thin Mailing Box Apricot Crush Orange 1-Piece A6 Mailing Gift Box
    Brand me Apricot Crush Orange 1-Piece A6 Mailing Gift Box
    FMA6AC22 178 x 131 x 22mm
    £0.76 £0.63
  32. White Mailing Box For 320 X 238 X 68mm White White Corrugated Postal Box White Internal
    Brand OnlineNo Insert White Corrugated Postal Box White Internal
    FMWW07 310 x 237 x 62mm
    From £0.96£0.80
    £1.16 £0.97
  33. White Mailing Box For 154 X 150 X 60mm White White Corrugated Postal Box White Internal 154mm length
    Brand OnlineNo Insert White Corrugated Postal Box White Internal 154mm length
    FMWW03 154 x 150 x 60mm
    From £0.36£0.30
    £0.72 £0.60
  34. 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
  35. 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
  36. 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
  37. 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
  38. 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
  39. 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
  40. 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
  41. 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
  42. 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
  43. 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
  44. Pack of 50 Single Wall White Packing Boxes
    Pack of 50 Single Wall White Packing Boxes
    W2ASCV030306 76 x 76 x 152mm
    £14.39 £11.99

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Our flat-pack postal boxes include a range of sizes and styles to suit all your product needs, from classic flat-pack boxes to pizza-style boxes and book wrap mailers...

What’s a flat-pack box?

A flat-pack box is a type of packaging that is supplied in a flat, unfolded form and requires assembly before use. These boxes are designed to be easily stored and shipped in a space-saving way, making them a cost-effective and practical choice for many businesses and individuals.

They're different from rigid boxes - which have a separate lid and base and don't fold or collapse. Find our range of rigid two-piece postal boxes here - with several options that also double as gift boxes!

Key benefits of flat-pack boxes 

Saves space: One of the biggest advantages of flat-pack boxes is their ability to be stored flat until you need them. This saves valuable storage space, making them ideal for businesses that need to keep a large stock of packaging materials without taking up too much room.

Quick and easy to assemble: Most flat-pack boxes are designed with self-locking tabs or creases to show you where to fold, allowing them to be assembled in seconds without the need for tape or glue. This makes them very convenient for businesses that require fast and efficient packing processes.

Strong and protective: Despite arriving flat, once assembled, these boxes provide excellent durability and structural integrity. Made from high-quality cardboard or corrugated materials, they offer reliable protection for delicate or valuable items during shipping and storage. 

Printable and customisable: Many of our flat-pack boxes can be easily customised with branding elements such as logos or printed designs. This makes them an excellent choice for businesses that want to create a professional and premium unboxing experience for their customers!

Uses for flat-pack boxes 

E-commerce and retail shipping: Flat-pack boxes are widely used by online businesses to package and ship products securely. They provide a professional appearance while keeping items well-protected during transit.

Gift and subscription boxes: Many businesses use flat-pack boxes for curated gift sets and subscription boxes. Their sturdy construction ensures items arrive in perfect condition, and their sleek design enhances the unboxing experience.

Storage and organisation: These boxes are great for storing documents, books, and office supplies neatly and securely. Their stackable nature makes them useful for organisation in both homes and businesses.

Flat-pack postage boxes

Whether for personal use or professional shipping, flat-pack boxes provide a practical solution that balances cost, efficiency, and sustainability. Want to check out some more options? Find our full range of postal boxes here!

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