Regardless, it offered most of the same features that a traditional backpacking pack does, including a relatively supportive frame. It isn't as supportive nor as feature-rich as several models in our review, but our testers found it to be surprisingly comfortable when carrying weights up to 35-40 pounds. When used at 30 pounds or below, we could hardly feel a difference between it and some of the much heavier models we tested. However, for loads upwards of more than about 40 pounds, we certainly wished we had something more robust.
Exos 38 has many of the same features, and its small size makes it a great daypack. For $160, it is 5oz lighter than the 58 we tested.
Exos 48 is an interesting in-between size, ideal for superlight backpacking or thru-hiking. For $190, the 48 shaves 2oz off the weight of the 58. We loved the Exos for its blend of lightweight and comfortable and believe you'll find the same in either of these alternative sizes.