Highly rated
"My first real hydration pack. Perfect for trail running and training in the heat of Réunion. Very lightweight and breathable. Washes and dries very easily. Very practical attachment system. Lots of pockets to hold everything you need. Maybe one or two pockets too many, since it’s easy to mix up the openings. Haven’t tried it with trekking poles yet. Slightly disappointed with the elastic straps for holding the water bottles, which are flimsy. And it’s very difficult to fit 500 ml bottles."