# Best shipping boxes for UK home sellers

> Single-wall, double-wall and postal boxes ranked by what they protect and which postage size they keep you in, from Large Letter to medium parcel.

You need three box sizes at most: a slim one for Large Letter items, a small parcel box, and a sturdier box for trainers or heavier goods.

Choose board strength by weight, the way you choose size by postage band. Single-wall board suits light items, and double-wall board survives the stacking and drops a heavy parcel meets in a depot.

1. **[Die-cut postal boxes for small parcels, 50 pack](https://sellersetups.com/product/small-postal-boxes)** (£18 to £28): Fold-up boxes that keep most small items inside the small parcel size.
   - Good for: Books, figures and beauty sets; Fast packing without tape
   - Not for: Items over 2 kg
2. **[Small single-wall boxes, 25 pack](https://sellersetups.com/product/single-wall-boxes)** (£8 to £14): Cheap boxes for light items that need shape more than strength.
   - Good for: Boxed toys and gift sets; Items under a kilo
   - Not for: Heavy or fragile items
3. **[Double-wall boxes, 18 x 12 x 8 in, 15 pack](https://sellersetups.com/product/double-wall-boxes)** (£22 to £34): Stronger board for trainers and anything heavy or easy to break.
   - Good for: Boxed trainers; Electronics and homeware
   - Not for: Small, light items, where it adds weight
4. **[Large Letter postal boxes, 50 pack](https://sellersetups.com/product/large-letter-boxes)** (£14 to £22): Slim boxes that protect small items at Large Letter postage.
   - Good for: Jewellery, coins and graded cards; Keeping postage cheap
   - Not for: Anything thicker than 25 mm when packed

## How we chose

- Keeps the item in the cheapest postage size
- Board strength for the weight inside
- Price per box in a typical pack
- Quick to fold and seal

## Single wall or double wall

Single-wall board has one fluted layer between two liners. It is light and cheap, and fine for items under about a kilo that cannot crack.

Double-wall board has two fluted layers. Use it for boxed trainers, electronics, glass and anything heavy, where a dented corner leads to a complaint.

## Sizing for postage

Royal Mail caps a Large Letter at 25 mm thick, 750 g and 353 by 250 mm across. Its small parcel tops out at 2 kg in a 45 by 35 by 16 cm space, and a medium parcel at 20 kg in 61 by 46 by 46 cm.

Pick boxes that sit a little inside those limits with room for padding. A box 1 cm too deep can push you up a whole price band.

## Boxes for common items

A boxed pair of adult trainers needs roughly 18 × 12 × 8 inches with padding. Books, figures and beauty sets fit small die-cut postal boxes.

Jewellery, coins and graded cards suit Large Letter boxes, so long as the packed box stays under 25 mm thick.

## Reusing boxes

A clean, rigid box from a supermarket or your own deliveries works well. Cover or remove every old label and barcode so the sorting machines read only yours.

Skip boxes with soft corners or water marks. They give way under the weight of other parcels.

## Questions

### What size box fits a Large Letter?

The packed box can be no thicker than 25 mm, no heavier than 750 g, and no larger than 353 by 250 mm. Check Royal Mail's current size guide before you buy postage.

### Do I need double-wall boxes for trainers?

For boxed trainers, yes. Buyers expect the shoe box to arrive without dents, and double-wall board resists crushing.

### What is the largest small parcel size?

Up to 2 kg, in a box no bigger than 45 by 35 by 16 cm, on Royal Mail.

### Can I reuse Amazon boxes?

Yes, if the box is rigid and you cover every old label and barcode.

### How much do shipping boxes cost?

In our typical bands, 25 small single-wall boxes run £8 to £14, and 15 large double-wall boxes £22 to £34.

### Should I tape die-cut postal boxes?

Most close with tabs, but a strip of tape over the lid stops it opening in transit.