How Big Are InPost Lockers

InPost lockers are designed to accept a wide range of parcel sizes while maintaining efficient and secure access. Knowing the compartment dimensions helps individuals and businesses choose the right parcel size, avoid failed drop-offs, and reduce wasted journeys. This guide explains the available locker sizes, weight limits and practical implications for sending and collecting parcels.

Locker Compartment Sizes

InPost offers four compartment sizes across its locker modules. The extra small compartment measures 4 cm by 23 cm by 40 cm and is ideal for very small items or documents. Small compartments measure 8 cm by 38 cm by 64 cm, suitable for items like sunglasses, mobile accessories or documents in envelopes. Medium compartments are 19 cm by 38 cm by 64 cm and work well for shoes, cookbooks or small clothing items. The large compartment measures 41 cm by 38 cm by 64 cm and is intended for bulkier items such as boots, larger electronics or sports equipment. These sizes ensure flexibility while preventing oversized items from being inserted.

Weight Limits

The maximum weight limit for any InPost locker parcel is 15 kg. This applies regardless of the compartment size. Parcels heavier than 15 kg or with one or more dimensions exceeding those given for the large compartment will be rejected or will require an alternative delivery method.

Why Compartment Sizes Matter

Choosing the right size prevents delays and avoids complications at the locker. Parcels that are slightly larger than the compartment may prevent the door from closing or trigger error messages during drop-off. If the parcel does not fit the selected size, users can cancel inside the app or select a different size before drop‑off. Most locker terminals also display prompts if the parcel appears too large once inside.

Practical Use for Senders and Sellers

When preparing parcels for ecommerce dispatch, knowing the compartment sizes helps sellers decide on packing materials. Standardised packaging that fits the medium or large compartments reduces mistakes and improves efficiency. Smaller packages can take advantage of the small compartment to reduce costs, while ensuring they do not exceed weight limits. Knowing these dimensions also helps when estimating feasibility for returns without home courier collection.

Locker Design and Configuration

The lockers are modular and can be built from central units or extended in increments. Each module offers compartments in all size bands so users can access the correct size at the terminal. Even where the smallest size is only offered digitally or in particular locker configurations, most standard locker banks provide at least small, medium and large compartments. Users who require the extra small size should check availability in the relevant locker via the app.

Maxims from the Network

In practical terms parcels entered into the network that exceed 64 cm in any given dimension cannot be accepted by the locker. This size limitation is widely noted by users online who have attempted to dispatch longer items such as poster tubes or large gift items. Those users report the only solution being to choose a courier service that allows larger parcel dimensions.

Summary

InPost locker compartments come in four sizes. Extra small measures 4 cm by 23 cm by 40 cm. Small is 8 cm by 38 cm by 64 cm. Medium is 19 cm by 38 cm by 64 cm. Large is 41 cm by 38 cm by 64 cm. Each parcel must also be 15 kg or under. Being aware of these dimensions helps ensure parcels fit correctly and ensures a smooth drop-off process for both individuals and ecommerce sellers.