"The circuit is an excellent, tough, lightweight pack for loads up to 35 lbs.
It lacks a framesheet, but has a hooped suspension with a lightly padded back-panel and solid 4 way adjustable hip-belt.
I use either a 4 section Z-rest pad, or a cut to fit Ridge Rest inside the pack to aid, with weight transfer and as a sit pad, in camp.
The hip-belt pockets are a nice feature for snacks, lighter, knife, headlamp etc...
I used the Circuit on a 42 mile 5 day hike and had just enough room, but probably could have gotten two more days worth of food into the pack.
Excellent pack for its weight of 2lbs.
I had no bad sore-spots at the end of the hike from the pack as well."