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. Strong, pre-printed side seams, serrated edges and tamper-evident closure. Folded bottom reveals puncture or cutting attempts. Strong construction helps prevent ripping or puncturing under normal use. Yellow area for detailing contents. 100% recyclable.