
Nothing. I was pleasantly surprised at how well this backpack handled my £100 lab. I bought XL. We went camping for two nights. It took some time to get used to. I made sure to do a few laps around the area before we hit the track. We had to make sure that the pockets were the same on both sides, otherwise they would hang on one side. The amount of stuff you can put in this bag is ridiculous! there are so many places! There are also pockets on the outside of the pockets as well as on the outside of the vest. There are even pockets inside the bags. He could carry his food, my friend's dog food, water intestines, poop bags, water bottle and blanket in a backpack. We went almost 7 miles and by the end of the day he showed no signs of chafing. For less than $20, this pack was a great investment. I liked how the pockets detached from his vest so I could easily relieve him during breaks without having to take the whole thing off. The only bad note I have is that a small crack has actually formed on the power supply. With as much activity as this weekend, I'm surprised he hasn't done more damage. He climbed rocks, jumped logs, swam in the river and ran as fast as he could without even noticing his backpack.

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