I bought this principally for the poorer weather months or for when I go on longer runs. Rather than pack my world into back pockets, this bag is a very useful size for storing things that you might want to get hold of, without having to unzip a rain jacket or gillet.
I've used the charging port, to power my GoPro when I forgot to charge it - the little power bank nestling comfortably in the bag along with cables, money, spare batteries, phone etc.
For those people who prefer not to spoil the lines of their beautiful bike, this is not for you, I have a medium frame and it takes up a few inches of top tube. That said, it does like quite neat
A good piece of advice that I heard about these, is that once you've got it attached how you want it, be prepared to cut off the excess lenghts of velcro. This will stop them protentially rubbing you and your shorts.
Perfect for what I need. It looks well made, no rain yet but seems substantial. Big enough to hold your phone, keys and a few bits of other pieces. Sits on my bike ok and I am glad I didn’t get the smaller one. Happy days.