The Exos 58 is an amazing light pack that is similar in design to Osprey’s Atmos series, just lighter. At 2 lbs 8 oz the Exos is the lightest weight pack in our review and one of the lightest packs that has a real frame. It has many great features and felt slightly bigger than its 58 liters would suggest. It is great for backpackers and trekkers as well as alpine climbers and mountaineers. For people traveling cross country, they might want a tougher pack, but for most hikers and backpackers who do the majority of there trips on trails, we think they will be perfectly happy with the Exos’s durability. The Exos frame isn’t flimsy and carries surprisingly well considering its weight.