I've got the Swift 10 and have used it 3 tjmes this spring. Twice for about 5 1/2 miles with up to 24# and no problems. The 3rd time I used it as a daypack with about 12# and 14 miles. It did great. I use 2 gossamer gear sit pads for the frame. I think it will handle up to about 27# with ease. I will try it next using just one pad.