Composed of coex material and featuring a void tamper-evident closure, these Dunbar VoidPak bags are top-of-the-line deposit bags designed for high risk security environments. Tamper-evident and temperature resistant, our VoidPak bags are accepted by all armored car companies because of its film strength and heavy-duty design. The premium security tape that displays "VOID" graphics when subjected to cold temperatures or peeling. The thermo heat indicator changes color when exposed to heat. The aqua detect indicator distorts or disappears when exposed to saliva or chemicals. This user friendly, single use deposit bag also features 0.25" security side seals with security printing, tear-off receipts with matching sequential number and a writable, white surface for easy use even under the most time-sensitive circumstances.