This tank is manufactured by the company Armotech and has an ultra-light and very stable stainless steel core. The weight of the bottle is only 650 grams, making it the lightest bottle on the market by far.
Specifications of the Armotech 1.1 liter Supralite Composite bottle:
Weight: 0.65 kg
Filling pressure: 300 bar
Filling volume: 1.1 L