Single-Wall Mailer Box — Medium
A clean die-cut mailer box for ecommerce despatch. The self-locking base assembles in seconds and the wrap-around lid gives a tidy unboxing experience. Strong enough for most non-fragile products without extra tape on the base.
Availability: Sourced to order — price, availability, minimum order quantity and lead time are confirmed by quote. Request a quote with your quantity and spec.
Sourced to order — price, availability, minimum order quantity and lead time are confirmed by quote. Tell us what you need and we'll come back with pricing.
Prefer to talk it through? Ask about this specification .
Key details
- Self-locking base — no tape needed underneath
- Wrap-around lid for a premium unboxing feel
- Internal size approx. 220 x 180 x 90mm
- Recyclable single-wall board
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
Specs, explained
- PiP (Pricing in Proportion)(Pricing in Proportion, PiP format, Royal Mail size-based pricing)
- Royal Mail's Pricing in Proportion system, where postage is set by an item's size and thickness as well as its weight. It sorts mail into format bands such as Letter, Large Letter and Small Parcel. More
- Royal Mail Large Letter(Large Letter format, LL)
- A Royal Mail PiP format for flat items up to 353 x 250 x 25mm and 750g. Staying within these limits keeps postage cheaper than Small Parcel rates. More
- Single-wall cardboard(Single wall board, Single-wall corrugated)
- Corrugated board made from one fluted layer sandwiched between two flat liners. It is the everyday choice for lightweight postal boxes and cartons. More
- Double-wall cardboard(Double wall board, Twin-wall corrugated)
- Corrugated board with two fluted layers and three liners, giving extra strength and cushioning. It is used for heavy, fragile or stacked shipments and moving boxes. More
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.
Poly or paper mailing bags — which should I use?
Poly mailers are waterproof, lightest and cheapest; paper mailers are kerbside recyclable with a premium feel but less water resistance.
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 beyond our core range through our supplier network.
