Walk into any ecommerce fulfilment operation and you'll find cardboard boxes. But not all boxes are the same, and the type of box you choose has a real impact on packing speed, packaging costs, damage rates, and the experience your customer has when their order arrives.
This guide covers the main types of ecommerce boxes available, what problem each one solves, and how to decide which is right for your products and volumes.
Standard boxes vs ecommerce boxes — what's the difference?
Standard cardboard boxes (sometimes called 0201 or RSC boxes) are the workhorses of transit packaging. They're reliable, widely available, and work well across a huge range of applications. But they have limitations for ecommerce:
- The base needs to be folded and taped before use — slow on a high-volume packing bench
- The lid needs taping shut — more time, more tape, more cost
- They come in fixed sizes — so multi-product orders often end up in a box that's too large, requiring void fill
Ecommerce boxes are designed to address one or more of these limitations. Most have features like crash lock bases, peel-and-seal closures, or adjustable sizing that make them faster to use and better suited to the demands of shipping individual online orders.
Browse our full ecommerce box range to see what's available.
Crash lock base boxes
The problem they solve: slow box assembly
A standard box needs its base flaps folded and taped before you can put anything in it — a process that takes 15–25 seconds. A crash lock base box has a pre-glued, pre-folded base that locks automatically as you open the box out. It's ready to fill in under 2 seconds.
For high-volume operations, this is one of the biggest single wins available. If you're packing 500 boxes a day and save 15 seconds per box, that's over 2 hours of packing time saved daily — without any additional headcount.
Crash lock boxes are particularly popular during peak periods like Black Friday and Christmas, when throughput has to go up without warning.
Best for: High-volume packing operations, seasonal peaks, any operation where box assembly is a bottleneck.
Self-seal postal boxes
The problem they solve: slow sealing
Self-seal boxes have a peel-and-seal closure strip built into the lid — similar to the strip on a padded envelope. Peel the backing, press firmly, done. No tape gun required.
Sealing a box with a tape gun takes 13–23 seconds. A peel-and-seal strip takes around 5. Across hundreds of orders a day, that's a meaningful saving. It also produces a cleaner, more consistent seal that looks more professional from the customer's perspective.
Many self-seal boxes also have a second tear strip for easy opening — which means the customer doesn't need scissors or a knife to get into their order.
Best for: Operations looking to speed up the sealing stage, or brands that want a cleaner, more considered unboxing experience.
Size-adjustable boxes
The problem they solve: multi-size orders
When you ship a wide range of products, you face a choice: stock lots of different box sizes (complex, expensive, space-hungry) or use a small number of sizes and fill the gaps with void fill (wasteful and slow). Size-adjustable boxes offer a third option.
These boxes can be scored and folded to different depths, meaning one box size can handle multiple product sizes. The result is less void fill needed, a neater pack, and fewer decisions for packers — which speeds things up and reduces errors.
Best for: Businesses with varied product ranges, operations trying to reduce the number of box sizes they stock, anyone spending too much on void fill.
Letterbox boxes
The problem they solve: failed deliveries
If your customer isn't home when the postman calls, the parcel goes back to the depot. That means a redelivery attempt, a frustrated customer, and potential complaints. Letterbox boxes are designed to fit through a standard UK letterbox (254mm × 38mm), so delivery happens first time, every time.
For low-value products, subscription boxes, or anything where the customer experience matters, letterbox delivery is a genuinely premium outcome. The customer comes home to find their order waiting for them rather than a "we missed you" card.
Best for: Small subscription boxes, low-value single-item orders, beauty products, supplements, stationery, and anything that suits letterbox dimensions.
Retention packaging
The problem they solve: void fill and presentation
Retention packaging holds a product suspended in the centre of the box, surrounded by a crumple zone on all sides, using either a clear stretch film or a paper sheet. The product is visible through the film — which can make for a striking unboxing experience — and no additional void fill is needed.
The paper retention option is increasingly popular for brands focused on sustainability, as the entire pack is recyclable. It's also a strong choice for fragile or premium products where the presentation of the item matters as much as the protection.
Best for: Premium products, fragile items, brands focused on unboxing experience, sustainability-conscious operations.
Insulated boxes for chilled and frozen products
The problem they solve: temperature control
For food businesses shipping chilled or frozen products — meat, cheese, ready meals, supplements, pharmaceuticals — a standard box isn't enough. Insulated boxes have an inner lining of polystyrene, wool, or layered paper that works alongside gel ice packs to maintain temperature for up to 48 hours.
If you're shipping temperature-sensitive products and currently relying on standard boxes, this is worth looking at closely. A failed delivery due to spoilage is an expensive problem.
Best for: Food businesses, chilled supplements, pharmaceuticals, anything that needs to stay below a specific temperature in transit.
Inside-printed and custom ecommerce boxes
The problem they solve: generic, unmemorable packaging
Your packaging is the first physical experience a customer has with your brand. A plain brown box says nothing. A box printed with your brand colours and messaging — particularly on the inside — creates a moment worth remembering (and worth photographing).
Inside printing works by printing onto the reverse of the board before the box is made. The outside stays plain (which means parcels travel discreetly, without advertising their contents), but the inside carries your brand clearly when the customer opens the box. This is particularly effective for luxury or premium products.
Custom ecommerce boxes can be printed using four main processes:
- Digital printing — high unit cost, no setup cost. Good for small runs, influencer boxes, or prototyping.
- Flexo printing — the most common process for production runs. Lower unit cost, but requires a printing plate (typically £150–£500).
- HD flexo printing — higher resolution than standard flexo. Plate costs are higher but unit cost is lower than digital.
- Litho printing — photo-quality finish. The most expensive option, best suited to high volumes where quality is non-negotiable.
If you're considering custom printing, we can advise on which process is right for your volumes and budget. Call us on 02476 611234 or get in touch online.
Which ecommerce box is right for you?
Most operations don't need every box type — they need the right one or two for their specific situation. Here's a quick steer:
- Packing speed is the priority → Crash lock base, self-seal closure, or both
- Variable product sizes → Size-adjustable boxes
- First-time delivery matters → Letterbox boxes
- Fragile or premium products → Retention packaging
- Temperature-sensitive products → Insulated boxes
- Brand experience matters → Inside-printed or custom boxes
Not sure which applies to you? We've been helping ecommerce businesses work this out for over 20 years. Give us a call on 02476 611234 or get in touch online and we'll point you in the right direction.
Related products: All eCommerce Boxes | Crash Lock Boxes | Size-Adjustable Boxes | Letterbox Boxes | Retention Packaging | All eCommerce Packaging
Ecommerce Boxes Explained — Which Type is Right for Your Online Store?