Collection: Shipping Boxes & Accessories

This collection covers over 20 products for the full dispatch workflow: postal boxes in a range of sizes, void fill, packing tape, labels and dispatch accessories. Products are selected for compatibility with Royal Mail, DPD, DHL, Evri and standard UK courier services.

Royal Mail Size Guide for Shipping Boxes

• Large Letter — maximum 353 x 250 x 25mm, up to 750g. Very few boxes meet this depth; flat postal boxes only.
• Small Parcel — maximum 450 x 350 x 160mm, up to 2kg. Covers most standard e-commerce shipping box sizes.
• Medium Parcel — maximum 610 x 460 x 460mm, up to 20kg. Larger shipping boxes and multi-item cartons.

Choosing the Right Box

• Measure your product — at its widest points (L x W x H), add 10–20mm on each dimension for void fill.
• Choose wall thickness — single wall for standard items up to 20–30kg; double wall for heavier or fragile items.
• Check the postage band — measure the packed external dimensions and weigh the completed item before buying at volume.

Benefits

• over 20 products — shipping boxes, postal boxes, accessories and void fill in one place.
• Royal Mail and courier compatible — sizes selected to align with standard UK postage bands.
• Single and double wall — for standard and heavy-duty applications.
• Recyclable materials — all cardboard boxes are fully recyclable through kerbside paper and card collection.

Frequently Asked Questions

What is the difference between a postal box and a shipping box?
Postal boxes (also called postal mailers or mailing boxes) are typically flat-pack constructions designed to be assembled quickly and posted directly — lightweight, often with self-locking or tuck-end assembly. Shipping boxes are regular slotted cartons (RSC) with four separate flaps — more robust for heavier loads, larger volumes or courier dispatch. For Royal Mail posting, postal boxes are generally more size-efficient; for courier dispatch, standard shipping boxes are the preferred format.

What box sizes are compatible with Royal Mail Small Parcel?
Royal Mail Small Parcel maximum external dimensions are 450 x 350 x 160mm, up to 2kg. A box at approximately 430 x 330 x 140mm internal dimensions (allowing for wall thickness) will reliably meet this limit. Always measure the completed, packed external dimensions and weigh the item before committing to a postage format at volume.

Are the boxes suitable for DPD, DHL or Evri?
Yes — standard single and double wall corrugated boxes are accepted by all major UK couriers. Ensure the box is securely sealed with packing tape on all flap joints for courier dispatch. Courier size and weight limits vary — check your specific courier's current guidelines, as these change periodically.