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“Compatible” describes whether it works. “Required” or “Useful” describes whether you should buy it.
Shark · Part XBGHV380N
Shark sells this as a large vacuum-accessory storage bag; because it is standalone, NV360 mechanical fit is not required.
This is loose-accessory storage; it does not attach to the vacuum body.
Shark · Part XBGV300
Shark lists the XBGV300 bag among NV360 add-ons for storing the vacuum's detachable tools.
This is loose-accessory storage; it does not attach to the vacuum body.
Open the evidence, limitations, and model identity for a single accessory.