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An ESD Metal-In or Metal-Out Bag provides shielding for ESD sensitive items enclosed in the bag. The bag opening must be closed, and should be sealed.
There two reasons for "sealing" the bag:
It is very difficult to maintain a snug enclosure without the bag being securely folded around the product and sealed. While "sealing" can be achieved by either "zip-lock" closure or by heat-sealing, we recommend that the bag be snugly folded over the product and the bag opening fastened down using either an ESD sensitivity symbol adhesive label or "low-charging" ESD adhesive tape. If tape is used, we recommend that it be printed with the ESD sensitivity symbol. This identifies the tape used as "ESD Protective" and not a standard, high voltage generating tape, and identifies the contents as requiring ESD control handling.
Per ANSI/ESD S541 section 6.2 Outside an EPA "Transportation of sensitive products outside of an EPA shall require packaging that provides:
1. Low charge generation.
2. Dissipative or conductive materials for intimate contact.
3. A structure that provides electrostatic discharge shielding."
Included in the checklist in the ESD Handbook TR20.20 section 184.108.40.206 ESD Packaging Materials "5. Are ESD protective packages properly closed? "
Per EOS/ESD S8.1 section 3.1 ESD Susceptibility Symbol Application states "The symbol may be incorporated on a sticker used to close or seal ESD protective packaging to indicate that materials inside the package are ESD susceptible."