Review on Stay Hydrated on the Go: KBNI Hydration Backpack with 2L Water Bladder for Outdoor Activities - Running, Hiking, Camping, Skiing, Cycling by Robert Blair

This is not suitable for adult walking, hiking or running. It's really small and most of the positive reviews I've read are about kids using it. These reviews are very accurate. At 6'0" he'll be on his back, but the tank placement will be weird, the shoulder straps will be weird, and the waist belt (which isn't needed) won't be in the right place. Make up your mind too not for those cheap tanks there are tons of similar packs out there with the same crappy tanks and mouthpieces the water flow is very mediocre and you just need to buy a better one from camelback or osprey to be happy this is a perfect example that you can get what you pay for. Try it and see what I've made of your desires. Then spend more and buy the branded option. At most it can be sold to children, but it's definitely not for adults suitable option.