The Planet Eclipse lightweight Air Tank powered by Armotech weighs only 960 grams (with reg), and has a capacity of 1,1l at 4500psi. These bottles have a stainless steel core and are wrapped with carbon fibers which makes these bottles extremely lightweight en strong.
The Ninja Standard regulator has 2 burst discs and allows you to adjust your pressure from 500psi, 650psi, or 800psi. This regulator is fully rebuildable and comes with a standard size gauge and long-lasting alloy bonnet.
I use this setup myself and can highly recommend it
weight: 1,1 kg
output pressure: 800psi