Collection: Postal Boxes

Cardboard postal boxes are the workhorse of UK ecommerce despatch - sturdy, single-piece cartons that fold flat for storage and pop up in seconds to protect books, clothing, accessories and small hardware in the post. At Parcelsend UK every postal box is held in stock at our UK warehouse for same-day despatch, so you can reorder packaging without pausing fulfilment. Choose plain kraft and white boxes off the shelf, or add your logo with custom printed boxes for a branded unboxing.

How to choose the right postal box

The best postal box is the smallest one your product fits into comfortably with a little room for void fill. Getting the size right keeps your parcel within the cheapest possible Royal Mail band and stops items rattling in transit.

Match the box to Royal Mail pricing

If you post through Royal Mail, box depth is what decides your postage. A box up to 25mm deep that stays within 353 × 250mm qualifies as a Large Letter - noticeably cheaper than a Small Parcel. Anything deeper moves into Small Parcel pricing (up to 450 × 350 × 160mm). Choosing a box built to these exact thresholds can drop a product that would otherwise ship as a parcel into the cheaper Large Letter rate.

Pick a size and colour that fits your brand

Postal boxes come in white and brown kraft. White gives a clean, premium look that suits retail and gifting; brown kraft is recyclable, understated and typically lower cost. For heavier or fragile contents, step up to a double-wall board and pair the box with void fill to immobilise the contents.

Why order postal boxes from Parcelsend UK

Everything on this page is stocked in the UK, so there are no import delays and no minimum-order surprises. Orders placed before our daily cut-off go out the same working day, and volume pricing means the more you buy, the lower your unit cost. If you sell across multiple product lines, you can mix postal boxes with mailing bags, packaging tape and void fill in a single delivery.

Key takeaways

• Postal boxes protect books, clothing and small products in transit and fold flat to save storage space.
• Box depth sets your Royal Mail price - up to 25mm deep (within 353 × 250mm) keeps a box in the cheaper Large Letter band.
• White kraft looks premium; brown kraft is lower cost and fully recyclable.
• Every box is UK-stocked for same-day despatch, with unit prices that fall as quantity rises.
• Add your logo with custom printed boxes, or keep costs down with plain stock.