A parcel headed for a locker must fit the compartment, and if it does not, you have to change the box, the size or the carrier. Here are the five mistakes we see most often.

1. Checking only one network

Compartment sizes differ. According to the carriers’ published data, DPD compartments are 43 cm wide, Omniva 38 cm and LP Express 35 cm. A box that suits DPD may not fit an LP Express compartment. If you ship with several carriers, choose dimensions for the smallest network.

2. Leaving no margin

A full box can bulge slightly, and the compartment door must close without force. A margin of a few millimetres costs nothing and avoids problems.

3. Choosing an oversized box

The bigger the compartment, the more expensive the shipment, and the box has empty space that needs filling. It is often better to order a box whose height matches an S or M compartment.

4. Ignoring weight

The compartment size says nothing about whether the box will carry the load. Carriers set weight limits (LP Express: up to 30 kg), so check them separately. 3-ply board is usually enough for light goods; choose 5-ply for heavier ones.

5. Not testing a real parcel

A size on paper does not always match a real packed parcel with inserts and tape. Before ordering a run, pack a real product and measure it. If you are unsure, we can make a sample or a short run.

You will find the compartment size table and box dimensions that fit all three networks on our parcel locker boxes page. If you make or resell boxes, see e-commerce boxes with crash-lock bottom, wholesale terms and the guide to buying from Poland. Send your enquiry through our home page.