Post & ship
A5 postal boxes
A5 postal boxes are defined by their footprint — around 210 × 148mm, the A5 paper size — rather than by a postage band. That familiar size suits paperbacks, prints, cosmetics, accessories and small gifts, and stacks and stores neatly on a packing bench.
Depth is the variable: a shallow A5 box can stay letterbox- and Large-Letter-friendly, while a deeper one takes bulkier contents as a small parcel. If your priority is cheapest postage rather than a specific footprint, start with our Royal Mail Large Letter boxes instead.
Shop the range
What an A5 box holds
- Paperbacks and A5 booklets or zines
- Prints and photo packs (A5 and smaller)
- Boxed cosmetics and skincare
- Small accessories and gift sets
Popular in this range
PiP Large Letter Postal Box — A5
Royal Mail Large Letter box, folds flat, 25mm deep.
Single-Wall Mailer Box — Medium
Die-cut ecommerce mailer, easy fold, self-lock base.
Custom Printed Mailer Box
Branded mailer boxes printed to your artwork.
Kraft Void-Fill Paper — 400mm Roll
Recyclable kraft paper for hand-scrunch void fill.
Related buyer guides
Before you order, check
- The internal size fits your product with room for protection
- The pack quantity matches how fast you get through them
- Postage banding — will it post as a Large Letter or a parcel?
- Whether you need a stronger grade for weight or transit
- If a recyclable or plastic-free option suits your customers
Stocked, or sourced to order
We hold the fast-moving lines and source the rest through our UK supplier network — so you get one honest point of contact whether an item is on the shelf or made to order. We don't claim stock or delivery speed we can't meet.
Stocked lines
Core products we hold and despatch in listed pack sizes. Buy online at trade pricing.
Supplier network
Custom sizes, printed and specialist lines sourced to order. Priced per order, with a lead time confirmed up front.
New lines
Products being added to the range. Leave your email and we'll tell you the moment they land.
Common buyer questions
What packaging do I need for ecommerce orders?
A box or mailing bag sized to the product, void fill or bubble wrap so nothing moves, plus tape and a courier label. Right-sizing keeps postage and damage down.
Which boxes fit Royal Mail Large Letter?
Boxes within 353 × 250 × 25mm post as a Large Letter. Our PiP postal boxes are cut to sit inside those limits so you pay the cheaper rate.
What is the best void fill for fragile items?
Pair cushioning (bubble wrap) around the item with void fill (kraft paper or air cushions) to stop movement. Fill any gap larger than about 3cm.
What tape is best for heavy cartons?
Use a stronger vinyl or solvent polypropylene tape for heavy or double-wall cartons, or gummed paper tape for a tamper-evident, recyclable seal.
Frequently asked questions
What size is an A5 postal box?
Will an A5 postal box post as a Large Letter?
A5 box or mailing bag for prints?
Buying in volume? Get trade pricing.
Tell us what you need — sizes, quantities and how often. We'll send pricing and lead time, and source anything we don't stock through our supplier network.
