At 5 Litres, this cylinder is a small and compact unit that can be easily carried into the field like our 3-Litre. With its low centre of gravity and wide footprint, its an incredibly stable unit. Filling to 300 Bar, complete with a boot and various adaption options; this cylinder is a great deal for people who need the mobility and storage benefits of a compact cylinder. New: We now include a removable air-flow restrictor with every Option 2 & Option 3 packages at no extra cost!