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An oxygen tank in the backpack's top-right slot.
An oxygen tank in the backpack's top-right slot.

The oxygen Tank is an item you can craft in your Backpack's printer using 1 Titanium.

When connected via a Tether to a base module or vehicle the tank will fill with Oxygen. The tank only begins filling once the main backpack tank has filled.

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 main tank, however no progress indicator is given for the tank item hitting 50% or 25% like the main tank does. The only indicator is a ding sound heard when the tank empties.