Personalised Letterbox Boxes 101mm x 101mm x 20mm White / Brown

Personalised Letterbox Boxes – 101 x 101 x 20mm (Internal Dimensions)

Create a professional branded unboxing experience with PackGenie's personalised letterbox boxes. With internal dimensions of 101 x 101 x 20mm, these compact custom printed postal boxes offer a practical packaging solution for suitable small products, accessories, samples and e-commerce orders.

Our custom printed letterbox boxes combine a compact design with full-colour digital printing, allowing you to showcase your logo, brand colours and artwork on your packaging. They're ideal for independent retailers, small businesses and online sellers looking to create a distinctive customer experience.

These small, single-wall corrugated boxes are designed for Royal Mail Large Letter packaging applications. Their internal height is 20mm, although you must check the fully assembled external dimensions and the weight of the packed parcel before posting.

Choose from white kraft paper outside with brown kraft inside or brown kraft paper inside and outside. Printing options are listed for the inside, outside or both sides, allowing you to personalise the box to suit your branding.

Add a finishing touch with custom printed tissue paper, branded stickers or printed packaging tape to create a coordinated presentation.

Key Features

• Personalised letterbox boxes with 101 x 101 x 20mm internal dimensions
• Compact square packaging for suitable small products
• Single-wall corrugated cardboard construction
• Micro-flute board described in the original product information
• Full-colour digital printing
• Inside, outside or both-side print options
• White kraft outside with brown kraft inside, or brown kraft throughout
• Designed for suitable Royal Mail Large Letter applications
• Recyclable corrugated packaging
• Manufactured and printed in the UK
• Free artwork preparation from suitable AI or PDF logo files
• No standard setup or origination fees
• Free standard UK mainland delivery
• Express delivery available at an additional cost

Custom Printed Small Letterbox Packaging

Our 101 x 101 x 20mm printed postal boxes are designed to help small businesses present their products professionally while keeping packaging compact.

The square shape is useful for suitable small items that fit within the internal dimensions. Custom printing allows you to add your logo, promotional messaging or branded artwork.

Potential uses include:

• Small accessories: Branded packaging for suitable compact items.
• Jewellery and gifts: Presentation packaging for appropriately sized products.
• Samples: Personalised boxes for product samples and promotional packs.
• E-commerce orders: Compact postal packaging for suitable online purchases.
• Subscription products: Branded packaging for small recurring deliveries.
• Events and promotions: Custom printed boxes for suitable giveaways.

Check the dimensions of your products and any protective packaging before ordering. Fragile items may require additional cushioning.

Royal Mail Large Letter Packaging

These personalised large letter boxes are intended for products that can be packed within Royal Mail's Large Letter limits.

The limits stated in the original product information are:

• Maximum length: 353mm
• Maximum width: 250mm
• Maximum thickness: 25mm
• Maximum weight: 750g

Important: The 101 x 101 x 20mm measurements are internal box dimensions. Royal Mail assesses the fully packed parcel, including its external dimensions, contents and total weight.

Do not overfill the box or allow it to bulge, as this could cause the parcel to exceed the permitted thickness. Always check current Royal Mail requirements before sending your order.

Full-Colour Digital Printing

Personalise your custom postal boxes with your business logo, brand colours, graphics or promotional messages using full-colour digital printing.

Digital printing offers flexibility for businesses that want branded packaging in smaller quantities or need to update their artwork as their brand grows.

Printing Options

• Outside printing: Showcase your logo and branding on the exterior.
• Inside printing: Add a message or design inside the box.
• Inside and outside printing: Create a coordinated branded presentation.

Final print placement and coverage should be confirmed with our team before production.

White and Brown Kraft Finishes

Choose from the following paper finishes:

• White outside / brown inside: A clean white exterior for your printed design, paired with a natural brown kraft interior.
• Brown inside and outside: A natural kraft finish for a minimalist or rustic packaging appearance.

Both options are designed to complement custom printed branding.

Single-Wall Corrugated Construction

These printed letterbox postal boxes are made from single-wall corrugated board. The original product information also describes the construction as micro-flute.

The compact construction provides a practical packaging format for suitable lightweight products. Additional internal protection may be needed depending on the item being posted.

Product Specifications

Delivery note: Delivery lead times begin after approval of your final artwork.

Artwork Templates

Need an artwork template for your 101 x 101 x 20mm personalised letterbox box? Email help@packgenie.co.uk to request the appropriate template.

Free Artwork Preparation

Send us your logo and design ideas and our team will help prepare your artwork for printing.

Free artwork preparation is available from suitable AI or PDF logo files. We'll email a proof for you to review before printing begins.

You can request changes to the design before approving the final artwork. Once approved, your order can move into production.

Production and Delivery Options

Choose from two delivery options for your custom printed letterbox boxes:

• Standard Delivery – 7–14 working days: Free delivery to UK mainland addresses.
• Express Delivery – 5–7 working days: Additional charges apply.

All delivery lead times begin from approval of your final artwork.

Complete Your Branded Packaging

Pair your personalised postage boxes with custom stickers, printed packaging tape or custom printed tissue paper to create a consistent branded unboxing experience.

Whether you're packaging small gifts, accessories or promotional items, these custom printed letterbox boxes help make every order more memorable.