The Lightweight High Capacity Tank is an equipment upgrade for the High Capacity O₂ Tank, giving the same +90 units of oxygen benefit for 135 total, but with only 25% the Swimming Speed penalty, -0.1 m/s underwater and -0.13 m/s on the surface, rather than the High Capacity tank's -0.4 and -0.53 m/s.
It can be crafted at the Modification Station combining a Plasteel Ingot and a High Capacity tank, after the player has retrieved its blueprint from a Data Box. When fabricated it is empty, even if the upgraded tank was full, and must be equipped in the tank slot of the Paperdoll UI while in atmosphere to be filled.
While not equipped, it takes up six slots (2×3) in the inventory with no speed penalty. Speed penalties only affect unassisted swimming, and do not matter while using a Seaglide.
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