Size the Packed Coil
A cable changes shape as soon as it is prepared for sale. Custom Cable Boxes should therefore be sized around the finished coil, connectors, tie and any printed insert rather than the cable's loose length.
A one-metre USB-C lead and a two-metre lead may use the same cable thickness and connectors but create very different packed diameters. Within electronics and gadgets packaging, that changing coil geometry is what gives cable packaging its own job.
Measure After Coiling
Prepare the cable exactly as it will enter production. Use the intended coil diameter, tie, paper wrap or reusable restraint, then measure the maximum width, height and thickness of the complete bundle.
Do not calculate the carton from cable length alone. The same two-metre lead can occupy noticeably different space depending on cable thickness and how tightly it is wound.
The tuck box sizing process is useful once the finished cable bundle is known because internal clearance also needs to account for paperboard thickness and closure movement.
Leave Space for Springback
A cable naturally tries to open after being coiled. If the carton is sized exactly to a tightly compressed bundle, that spring pressure can push against the side panels and make the closure harder to operate.
Allow enough room for the prepared coil to sit naturally without rattling or pressing continuously against the walls.
This is a good point to test physically. Free samples can help assess stock and general carton quality, while a fully custom sample is more useful when a particular cable coil or restraint needs to be checked before a larger production run.











