I'm glad you have had good luck with Mountainsmith. I haven't. The very first time I used their medium dog pannier backpack, two straps ripped out within 1 mile. I was very disappointed to find the straps were just sewn into the seam of the bag with no reinforcement. The dog is well behaved and the load was only about 6 lbs. I bought from them because of their reputation for quality. Oh, well . . .

Jeff