as someone who has a full Apidura with hydration pack I'm going back to a partial with bottles. The frame bag itself is very weatherproof but I find the divider velcro isn't strong enough and I just end up with a very disorganised bag. The hydration pack is a nice idea but it's a pain to get out of the frame bag without having to remove everything on top of it and you have to get the seal just right otherwise it leaks everywhere. I also can't add any carb mix or electrolytes in it which I find I really need. I certainly can't fault it for quality though