The Durable Contraband Pouch is an item that conceals Contraband in your inventory from Contraband Detectors.
It will lose 15% durability every time you pass through a Contraband Detector with contraband items other than the pouch itself. It is good for 7 uses.
The Contraband Pouch can be found in prisoner stash or by crafting the following items:
Durable Contraband Pouch
Foil x1 + 
Roll of Duct Tape x1