We have a wide selection of stock sizes for tamper evident security bags -- including large sizes up to 30x36 inch, which are difficult to find.
All of our tamper evident security bags feature a tamper evident closure system using VOID tape. After inserting the contents, the security bag is sealed. If the closure is opened, it will show some form of tamper evidence (the bag will be torn, the word "VOID" or "OPENED" OR "STOP" will be visible, etc).
If you want to use a tamper evident security bag, but conceal the contents, first place the contents in a opaque envelope or bag, then seal it in the security bag/envelope.
Tamper evident security bags and envelopes are used to secure documents, personal effects, cash, or other valuables. The security bags on this page are transparent for viewing the contents, which is required in some applications.
We can also customize tamper evident security tape with high quality. More details via www.voidmaterial.com