Fold-up boxes sized to stay a small parcel.
Typical price
£18 to £28
Why we pick it
- Typical price
- £18 to £28
- Works with
These fold flat, close without tape and sit under the small parcel size of 45 × 35 × 16 cm. Pick a depth that fits your usual item with a little padding.
Good for
- Books, figures and beauty sets
- Fast packing without tape
Not for
- Items over 2 kg
Our approved alternative for the same job: Small single-wall boxes, 25 pack
The guide
Each step in the order you'll need it.
Items too deep for a Large Letter
This box suits you if your items are too deep for a Large Letter but nowhere near a big carton: boxed figures, a pair of children's trainers, a squishy toy, skincare sets, a small gadget or homeware piece.
At five to fifteen parcels a week on eBay, Vinted or TikTok Shop, you work through a 50 pack in one to three months. Once you ship daily, a pallet order from a packaging supplier usually cuts the cost per box.
External size, tabs and a second seal strip
Royal Mail's Small Parcel size is 45 by 35 by 16 cm, so pick external sizes inside those figures with a little margin. Royal Mail's size guide has the current limits and weight caps to confirm before you settle on a box.
Die-cut boxes fold from one sheet and lock with tabs. Choose single-wall corrugated board, a tuck-in lid with side dust flaps, and ideally two strips of peel-and-seal so the buyer can close it again for a return.
Buy two or three depths if your stock varies. A box that fits the item closely needs less filler and resists crushing better.
Folding, filling and closing
Fold the base and sides along the creases, then push the end flaps in until the locks click. Do a dry fold of a new size before packing, as some boards need a firm press along the score lines.
Wrap fragile items in bubble wrap or honeycomb paper, then fill the corners with paper so nothing moves when you shake the box. Close the lid and seal it with the strip or a single band of brown tape.
Stick the shipping label flat across the lid without wrapping over an edge, and weigh the finished parcel before you buy postage.
Kit for this step
Other boxes and when to use them
Small single-wall boxes, 25 pack, are the fallback: standard cartons that you tape shut, useful for awkward shapes or when you run out. Double-wall boxes, 18 x 12 x 8 in, 15 pack, are the step up for heavy or fragile items going by courier.
Large Letter postal boxes, 50 pack, take flat items and keep the postage lower. Grey mailing bags, 10 x 14 in, 100 pack, suit clothing that cannot break and costs less to send.
Box protectors for vinyl figures, 20 pack, go inside this box when a collector expects a mint display box.
Packaging under a pound per parcel
Spread over 50 boxes, a £18 to £28 pack puts about 36p to 56p on each order. With a little filler and a label, packaging stays under a pound for most small parcels.
Reuse clean boxes from your own deliveries for low-value items, and keep the new die-cut boxes for orders where presentation counts. Cover old labels and barcodes fully on any reused box.
Common mistakes
Each one costs you money or reviews, and each has a fix.
- Allow a centimetre or two on each side; a box sized to the exact item leaves no room for wrap.
- Folding against the score lines weakens the corners. Press along the creases first.
- A heavy item can split the base of a single-wall die-cut box, so move to double-wall for weight.
- Fit the label on one flat face. Wrapped over an edge, it fails to scan.
- Old barcodes left visible on a reused box can misroute the parcel; cover every old label.
Ranked in
Where it places in our rankings, and the reason.
Setups that use it
Complete kits this product is part of.
Questions
Will these stay within Small Parcel size?
They are sold to sit under 45 by 35 by 16 cm. Measure the external size of the one you buy against Royal Mail's current limits, including weight.
Do die-cut boxes need tape?
The locking tabs hold the box together. Add the peel-and-seal strip or a single band of tape across the lid so it stays shut in transit.
Which depth should I buy first?
Measure the five items you sell most and pick the depth that fits most of them with a layer of wrap. Add a second size later.
Are these fine for courier services as well as Royal Mail?
For light items, yes. Couriers handle parcels more roughly, so wrap fragile pieces well or use a double-wall box.
Can buyers reuse them for returns?
Boxes with a second peel-and-seal strip close again without tape, which makes returns easier for the buyer.
Alternatives
Other picks for the same job, cheaper and pricier.
Small jewellery boxes, 50 pack
A foam insert holds the piece still in the box. The box fits in a padded envelope, so most orders still go as a Large Letter.
Typical price£8 to £14
See on AmazonSmall single-wall boxes, 25 pack
Use these for boxed toys and beauty sets that a padded bag would crush, when double-wall board costs more than you need.
Typical price£8 to £14
See on Amazon12-inch LP record mailers, 10 pack
A folding board mailer holds one 12-inch record flat with stiffeners either side, so the corners and sleeve seams survive the sorting belts. Buy them if you sell vinyl every week; for a box set or a stack of records, use a small box with bubble wrap instead.
Typical price£10 to £18
See on AmazonLarge Letter postal boxes, 50 pack
A slim box under 25 mm deep protects a small item better than an envelope and can still go at Large Letter postage. Measure the packed box before you buy postage.
Typical price£14 to £22
See on Amazon