What Are Custom Flat Shipping Boxes UK?

Flat shipping boxes, also known as flat-pack boxes, are used to maximise package capacity while minimising courier fees and meeting standard UK letterboxes, ensuring hassle-free deliveries every single time. Created from FSC-certified material with 1/8″ B-flute corrugated cardboard and tuck-tab closure on both ends for easy packing and opening, these corrugated flat shipping boxes are sturdy yet durable and delivered flat for ultimate space efficiency. These easy-to-assemble shipping boxes snap into rigid mailers that speed up your packing process. They are utilised by many e-commerce and retail brands to safely transport flat items like:

• Books
• Large documents
• Magazines
• DVDs
• Picture frames
• Legal contracts
• Tablets
• Laptops
• Important certificates

Sturdy Material Selection For Personalised Flat Shipping Boxes

When it comes to choosing the material for manufacturing, packaging specialists at Custom Boxes Market UK prefer FSC-certified and 100% recyclable materials. We offer biodegradable material for flat shipping boxes to ensure carbon-neutral delivery and zero-plastic packaging that meets UK standards and satisfies our clients.

Corrugated paperboard

Engineered with three layers, two flat outer linerboards and one inner fluted (wavy) layer, corrugated cardboard is the industry standard for shipping boxes that provide foldability while keeping the structural integrity and resistance against crushing during transit.

Single Wall Board

This single wall of corrugated cardboard (with B-Flute, C-Flute, E-Flute) is very common and is used in custom mailer boxes to balance structural strength and a smooth surface. Suitable for printing logos and alluring designs.

Double Wall Board

This double wall board is used for heavier or bulkier items that require stacking strength to withstand crushing.

Kraft paper

A biodegradable material to entice eco-conscious UK brands and customers. Recyclable Kraft paper is thinner than corrugated cardboard but is still used to ship fragile items like clothing or A4 documents.

Flat Shipping Box Sizes UK

The sizes of flat shipping boxes depend on the weight and dimensions of the package. Whether it is e-commerce fulfillment or subscription box packaging, Royal Mail sizing (PIP) in the UK helps to determine whether your item qualifies as a Large Letter or a Small Parcel. Save time and money by smoothing out your logistics pipeline by choosing the sizes available (L x W x H in cm) for UK customers:

• 45 cm × 35 cm × 16 cm box weighs 170g to 230g empty
• 35 cm × 25 cm × 2.5 cm for an average weight of 70 g to 90 g
• Custom sizes

Custom Printing

Equipped with modern printing methods, we utilise sharp and high-resolution custom printing for flat shipping boxes to make your UK-based business stand out and wow customers right on the doorstep. We offer:

• Offset printing
• Flexography printing
• Digital printing
• Screen printing

Premium Print Finishing

First impressions are everything. Take your custom printed shipping boxes to the next level by giving them an extra touch of luxury finishes available in our collection to leave a lasting impression on UK customers.

• Anti-scratch lamination
• Silk lamination
• Spot UV coating

• Foil stamping
• Embossing
• Debossing

Why Choose Us!

Custom Boxes Market UK is the trusted bulk flat shipping boxes supplier in the UK. For years, we have been manufacturing sturdy packaging boxes for many businesses, helping them to streamline their supply chains. From customisation to design and printing, we are the number one choice of top UK e-commerce and retail businesses. Whether you need corrugated or e-commerce shipping boxes, we offer the lowest rates. Free delivery across the UK. Our turnaround is the quickest. Contact us to book your order by dialling our direct phone number or via live chat support. Or email us at sales@customboxesmarket.co.uk for a custom quote.