Firstly this pouch is extremely durable and solid. The manufacturer guarantees it for life.
The opening is large and easy: just a quarter turn to unscrew the cap. Once closed, it is completely sealed.
The feeding tube can be removed when the bag is full. Through their system, there is no possible escape ...
The extras are: hook for attaching it to the back and to the incomparable drying system bag.
Under the opening, there has 2 small wings to fold which allow "open" the bag, when upside and we are in the process of drying washing. CamelBak has thought of every detail.
A great product that I recommend it.
I hope this review has been helpful ...