Okay really I got the Approach 2 pack, and it's not on here anymore, but it's still a good pack. Easy to keep clean, easy to adjust, looks good! I have a belgian malinois ( google it if you don't know what it is, and NO it's not a german shepherd.) and if I had gone by the sizing I would have gotton a Large, but my dog is a medium. But returning something through these guys is easy, so if you need to adjust it's cool. I was a bit of a turd and went to a local store that sold the same item I bought to make sure I was getting the right size, and ordered it from these guys! It was the first thing I had got from here, and it won't be the last. Ruffwear makes good durable stuff anyway, my dog doen't mind wearing it. Keep in mind that you should only put 1/3 of your dogs weight into the saddle bags no mater how much your dog weighs. The medium for my dog is a good fit with out sliping. Had I gone with a large I wouldn't have been able to adjust it right and the back strap was right under his doggie junk, so if he peed I would have to wash it. The back strap should NOT ride right under the doggie junk, cause chaffing is bad, person or dog.