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Flat brown postal boxes, 400x400x50mm

Up to 20% OffPartnership products
From  £0.79  ex. VAT  per box
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Quantity Unit price
50 + £1.02
100 + £0.94
200 + £0.89
500 + £0.84
1000 + £0.79
  • 50mm high flat postal boxes
  • Sturdy alternative to postal bags
  • Ideal for posting or presenting books & DVDs
  • Cleverly constructed for easy assembly
  • Sold in packs of 50, priced per box
Read more …
Product features
length mm400internal width mm400
internal height mm50mail formatmedium parcel
pack quantity50
Detailed description

Flat boxes ideal for posting products up to 50 mm thick

The flat and sturdy alternative to mailing bags and book wraps these flat postal boxes can be used for posting, storage or presentation. They are easy to open and cleverly constructed with a cut away hole to aid opening. Easy to assemble flat postal boxes with no need for glue or tape. Secure with packaging tape or strapping for extra security.

The integral lid and double reinforced sides provide extra protection for your flat postal items. Manufactured from high quality single wall corrugated board with a Kraft finish. Also available in white. Delivered flat packed.

Order now online or call us on 0800 542 44 28 for expert packaging and wrapping advice.

Sold in packs of 50, priced per box.

Quantity Available in convenient packs of 50 boxes. Ordering in bulk? See our discounts for 100 or more boxes.

Size and shape options Our flat brown postal box range begins at 215 mm by 155 mm for smaller items, and goes up to 650 mm by 450 mm. All boxes have a height of 50 mm (all dimensions internal).

Weights and limits These boxes benefit from double reinforced sides.

Materials Each box is made from puncture-resistant, single wall corrugated cardboard finished with durable Kraft paper to provide extra strength and protection.

Environmental information RAJA cardboard boxes are 100% recyclable and corrugated cardboard has the highest recycling rates of any packaging in the UK. On average, 76% of our boxes are made from recycled fibres and the ‘recycling loop’ is so efficient that used boxes can be recycled, remade and reused in just two weeks.

Delivery information Delivered flat-packed in packs of 50 for easy storage.

Customer reviews
See all 59 customer reviews
Most recent customer reviews
Great quality, amazing product and will buy again
By Megan on 29/03/21 13:48 - Verified Purchase by TrustPilot
Reference : BEP203
very good
By Ellie on 08/03/21 20:46 - Verified Purchase by TrustPilot
Reference : BEP205
Fantastic and easy to build boxes
By Moray on 16/02/21 22:21 - Verified Purchase by TrustPilot
Reference : BEP110
By Katie on 20/12/20 13:48 - Verified Purchase by TrustPilot
Reference : BEP220
Great Boxes
By Claire on 11/12/20 20:57 - Verified Purchase by TrustPilot
Reference : BEP205
See all 59 customer reviews