Just bought a 115L after using a friends to shuttle loads to the base of a wall. I was impressed with the durability and pleased with the ease of loading due to the wide mouth. We were shuttling loads of approximately 75lbs. With loads that heavy the pack isn't going to be comfortable for extended periods but is plenty tough to handle it. They are also a great option for gear caches where you need to seal out the elements (ie, Patagonia and the greater ranges).