Haven't used it yet, but I love how looks, fits and the many wonderful features. I wanted a comfortable day pack that had traps for my walking poles and extra straps to attach things that wouldn't fit inside. I bought bright colors, in case someone ever has to try and find me in the woods. Some people say the whistle doesn't work. Well, I'm not the best whistler, but after a couple tries, it worked just fine. You must make the air pass through a certain way, make adjustments, and you're good to go. I like the buckle between the straps so I don't have to make an effort to keep it on my shoulders. I also like the hip belt to spread out the weight more evenly. Can't believe how it can be sold at this price, but at this point in time, I'm loving it!