Crash lock boxes are cardboard boxes with an automatic base. The base locks into place as you open the box, so it goes together in seconds with no tape underneath. Pack Solution stocks 14 sizes from 100 x 100 x 70mm to 426 x 300 x 300mm, sold per box, for e-commerce, subscription and retail packing across the UK.

Key features of a crash lock base box

• Automatic crash lock base: open the flat box out and the base folds and locks by itself.
• No tape on the bottom: only the top needs closing, which uses less tape and takes less time.
• Retail-ready look: a clean shape for products, samples and crash lock gift boxes.
• 14 sizes: the range runs from the 100 x 100 x 70mm CL-A to the 426 x 300 x 300mm CL-K.
• Sold per box, minimum 5: buy 5 or more of any size, with bulk discounts as the quantity grows.

Crash lock boxes: sizes and specifications

Each crash lock carton is listed by code, and dimensions are length x width x height.

Each size is a cardboard crash lock box priced individually, supplied flat, with a minimum of 5 boxes per order.

Which size do I need?

Measure your product and leave room for any wrap or void fill. These are rough suggestions based on the dimensions:

• Small crash lock boxes: CL-A (100 x 100 x 70mm) suits jewellery, small cosmetics and samples.
• Long, narrow items: CL-C (180 x 100 x 50mm) and CL2 (200 x 100 x 100mm) fit tubes or boxed accessories.
• A5 items: CL-F or CL4 (290 x 208 x 95mm) holds an A5 item (148 x 210mm) flat with space left over.
• Large crash lock boxes: CL-J (426 x 300 x 150mm) holds an A4 item (210 x 297mm) flat, and CL-K (426 x 300 x 300mm) is the deepest size.

Ideal for

• Crash lock boxes for e-commerce at high volume
• Postal boxes for subscription orders
• Retail products and samples
• Sellers on eBay, Etsy and Vinted who want fast assembly postal boxes

Bulk and trade pricing

Crash lock boxes are sold per box, excluding VAT, and the price per box falls automatically as your quantity rises, using the tiers on this page. The minimum order is 5 boxes per size, and every order comes with a VAT invoice. For pallet quantities of crash lock base cartons or regular trade orders, call 0161 706 1246 or email [email protected].

Delivery and collection

Orders placed by 2pm Monday to Friday are dispatched the same day from Manchester. Royal Mail Tracked 48 is free on every order with no minimum, DPD Next Day is 7.99, and click and collect from Manchester M8 8HF is free. Large parcels to the Highlands and Islands, Northern Ireland, the Isle of Wight, Scilly, the Isle of Man and the Channel Islands carry a 14.99 ex VAT surcharge. See our delivery information.

Frequently asked questions

What is a crash lock box?

A crashlock box is a cardboard box with an automatic base that locks into place when you open it. It assembles much faster than a standard box that needs taping underneath. It is also called a crash lock bottom box.

Do crash lock boxes need tape?

The base needs no tape. You close the top flaps and seal them with tape or a label, whichever suits how you post.

What sizes do crash lock boxes come in?

We stock 14 sizes, from 100 x 100 x 70mm to 426 x 300 x 300mm. The table above lists each box code.

Can I buy crash lock boxes individually?

Yes. They are sold per box, with a minimum order of 5 boxes per size, and the price per box falls automatically as you order more.

Are crash lock postal boxes suitable for posting?

Yes, they are cardboard postal boxes. Close the top, stick on your label and send.

Related products

Compare with our brown die cut boxes, double wall cardboard boxes and PIP large letter boxes, or see every cardboard box we stock. For background, read why cardboard boxes matter for storage and shipping.