Top loading technical backpack purpose built for super light backpacking and thru hiking the osprey exos 48 litre rucksack features an airspeed sl suspension system which uses a peripheral aluminium alloy frame to provide excellent load carrying supportosprey are experts at designing technical packs which offer incredibly versatility across a wide range of activities and terrain types the exos rucksack is a 48 litre top loading pack designed specifically for super light backpacking and thru