The only time I am aware of this hydration pack is when I need to take something out of it or put something into it. Well thought out, light and comfortable. Brilliant.
Overall, the Aonijie has served me well for several long training runs and two long races. If you are looking to buy a new or your first (this was my first) hydration vest, I would highly recommend looking into this vest.
So, if you want a competition backpack, with top finishes and at an affordable price, the Aonijie With Wind 5L takes the cake without a doubt. It also incorporates details that other backpacks of major brands do not remember, such as waterproof pockets with zipper, several options for placing sticks and thermal blanket included.