Helium is a bit unique in that it is a very light backpack at a low price. Personally, I think it is a comfortable all-round bag that is suitable for multi-day trips.
This backpack is a favorite of many, for its flexibility, light weight and comfortable fit. The back length is adjustable, you can remove both the top cap and waist belt to further lighten the weight or use as a waist bag. Helium features top opening, front opening, compression straps to adjust size and large side pockets. In addition, there are loops on the backpack as attachment points for equipment under and on the outside of the backpack. It is possible to combine the sack with a liquid system. It also comes with a rain cover.
Specification:
Volume: 55 liters
Weight: 1000 g
Back length: 45-56 cm
Max package weight: 18 kg
Fluid system: Yes, space for internal
Removable cylinder head: Yes
Rain cover: Yes