You can ship 3 sizes of parcel with InPost using Shiptheory. It is important you select the correct size as an InPost locker will be made available to you based on the size of your parcel.
InPost Parcel Maximum Sizes:
- Small Parcel - 8 cm x 38 cm x 64 cm
- Medium Parcel - 19 cm x 38 cm x 64 cm
- Large Parcel - 41 cm x 38 cm x 64 cm