ESD Sensitivity of Diodes and BJTs

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Note that there's no such thing as ground, and ground doesn't matter.

Ground is only used as a simplifying convenience.

A sufficiently conductive bag shorts out ambient E fields, shielding the contents (i.e., as a Faraday cage) and allowing the bag to be passed between any potential environment.

But what about sparks?

Induction.  If the bag is fully enclosed by the local potential, at each end point, then it has the same charge it always did: zero relative to those surroundings.

In practice, handling isn't going to deliver all the charge from induction, and sparks will happen.  Which is why extra layers, and extra conductivity, and grounding precautions, are helpful.

Tim