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The Tank attaches to any 1-slot and stores as much oxygen as the backpack's main tank (70 seconds when idling, 50 seconds when running). So having one Tank in the backpack doubles the player's oxygen storage.
When not tethered, the tank item is consumed prior to the backpack's. The only indicator is a ding sound heard when the tank empties.
- After the 182 Patch the Tank cannot be equipped into the backpack's Widget slots.