MelissaJLwrote a review of Ruffwear Approach Dog Pack on March 12, 2013
These backpacks are great! I bought two in blue, size M for my 90 lb German shepherd dogs. There is a lot of room for adjustment upwards for larger dogs, but I wouldn't go down much in size. They are easy to adjust and seem comfortable. My dogs have never worn harnesses, we strapped on the Approach pack and took the dogs out, they hardly seemed to notice.
Balance is KEY. We put full water bottles in the pack of one dog and drank about 3/4 from one bottle, which created a terribly lopsided pack. Drink evenly from both sides!
The dogs were easily twice as tired as usual wearing the packs. I love bringing home happy, tired dogs after a nice hike :)