The six crash lock sizes are a list. Goods that miss the list need a different box, not more fill. This page stays with crash lock boxes.
Packaging Boxes keeps Crash lock boxes apart from a tape-closed cube. The category describes the board as 150K/T, recyclable and biodegradable, and sized towards Royal Mail small parcel guidelines. It lists six sizes.
What this collects
A crash lock box opens into shape and has a peel-and-seal strip.
The notes below stay on crash lock boxes. A tape-closed cube is the right box when the size you need is not one of those six, or when the goods are not a small parcel.
Before the order goes in
Pick from the six sizes. If none is close, use single wall rather than a crash lock that is mostly air.
A Friday order on Packaging Boxes that includes Crash lock boxes aims for Monday. A bank holiday on Friday or Monday moves that delivery. The 3pm cutoff is still the same-day dispatch rule.