MMF Industries 2362010N06 9-by-12-Inch Tamper-Evident Deposit Bags, 100 Pack (White) Bags feature level 4 security, the highest security with the most sophisticated tamper-evident technology available and cannot be bypassed by heat, cold, saliva or seam tampering. Peel-off receipt, barcoding and unique alphanumeric numbering for traceability. White Folded bottom reveals puncture or cutting attempts. Strong construction helps prevent ripping or puncturing under normal use.