Choosing the correct cardboard box size can significantly reduce your shipping costs and help avoid courier surcharges. Whether you’re sending products through Royal Mail or Evri, selecting a box that fits within the correct parcel category ensures you only pay for the space you need.
At KB Packaging, we stock a wide range of cardboard boxes suitable for everything from Royal Mail Small Parcels to large courier shipments.
Courier Category | Maximum Dimensions | Typical Use |
Royal Mail Large Letter | 353mm x 250mm x 25mm | Documents, books, slim products |
Royal Mail Small Parcel | 450mm x 350mm x 160mm | Ecommerce orders, gifts, clothing |
Royal Mail Medium Parcel | 610mm x 460mm x 460mm | Larger products and multi-item orders |
Evri Postable | 350mm x 230mm x 30mm | Letterbox-friendly products |
Evri Standard Parcel | Up to 1200mm longest side | General ecommerce shipping |
Evri Large Parcel | Up to 1200mm length and 2450mm combined dimensions | Bulky items |
Find out more about Royal Mails Shipping Sizes here
Royal Mail Small Parcels must not exceed 450mm x 350mm x 160mm.
The following KB Packaging boxes fit comfortably within this category:
KB Packaging Box Size | Courier Category |
Royal Mail Small Parcel | |
Royal Mail Small Parcel | |
Royal Mail Small Parcel | |
Royal Mail Small Parcel | |
Royal Mail Small Parcel |
These sizes are ideal for:
Royal Mail Medium Parcels must not exceed 610mm x 460mm x 460mm.
Popular KB Packaging options include:
KB Packaging Box Size | Courier Category |
Royal Mail Medium Parcel | |
Royal Mail Medium Parcel | |
Royal Mail Medium Parcel | |
Royal Mail Medium Parcel | |
Royal Mail Medium Parcel |
Perfect for:
These larger boxes are generally more suitable for Evri, DPD, DHL, APC, Palletways and other courier networks:
KB Packaging Box Size | Suitable Courier Services |
Evri, DHL, DPD | |
Specialist courier services | |
Freight and pallet networks |
Sending Clothing?
Most clothing orders fit within Royal Mail Small Parcel limits. Boxes around 229mm x 152mm x 152mm or 305mm x 229mm x 127mm are popular choices.
Sending Subscription Boxes?
A 305mm x 229mm x 229mm or 400mm x 300mm x 270mm box is often ideal.
Sending Homeware or Fragile Goods?
Choose a double-wall box such as 400mm x 300mm x 270mm for added protection.
Sending Large or Bulky Items?
Consider larger double-wall cartons or pallet boxes for maximum protection and cost-effective courier shipping.
Need help choosing the right box size? Contact the KB Packaging team and we’ll recommend the most cost-effective packaging solution for your products.
Find the Right Cardboard Box for Royal Mail and Evri Deliveries Choosing the correct cardboard box size can significantly reduce your shipping costs and help
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