We were not sure we would like the new design. Our last dog Rufus used his pack over 100 times during his incredible 15 year life. That pack held up great. The new Approach Pack is even better, the design is sleeker and along with flopper stopper system kept the pack in place even when Foxie was doing her Tigger imitation running through mountain meadows. New padding for the frame I think is more comfortable and the pockets are very handy. She carried two days of dry food, snacks, bear hanging rope, a can of tuna, two bowls and a small drop cloth on a 12 mile Marble Mountain Wilderness backpacking trip. 5.6lbs total.
Foxie is 35lbs and is long and skinny. Super athletic Border Collie cross. We bought the small and it is as tight as can get. It fits perfect.