I bought this product following a recommendation and must say that I'm extremely happy with it in comparison to my previous Camelback hydration pack. What do I love about it; even when the bottles are full, the pockets rammed with gels and bars and the backpack is stuffed, although it feels very heavy, once it's on it feels very comfortable. As the pockets are all external the jacket shrinks as you work your way through your fuel keeping it snug. I personally think it looks good too with black being my colour of choice. What don't I like; the phone pocket is quite tight and awkward to access when the bottle is full and still not great when it's empty so I just use one of the side pockets. The two straps gradually work themselves loose as you run but you can retighten easily with a quick pull on the go so it's not a real issue. What would I like; perhaps an option to buy a third strap as this could make it even more comfortable. Any tips on how to get all the air out of the bottles as the recess in the lid traps a small amount, again not a massive issue as it doesn't cause too much sloshing once you've started drinking