Topeak makes some really nice quality items, and this bag is no different. It’s a nice size for all your essentials like wallet, phone, keys… Plus, it’s well made with a place to clip on your light. Have a look at it:
You could find a cheaper bag, but probably not of the same quality. And when it comes to bags consistency is important. Some of the cheaper bags can make a decent one sometimes, but you might not get one of the good ones. Topeak however I think has a good level of quality control. Check out some of the features:
Made from 1000 denier nylon
Approximately 7.9 x 4.7 x 4.1”
Expands to fit more stuff
QuickClick attachment makes it easy to switch to different bikes
3M reflective strip
Mesh pocket to hold small items
Back 
Expandable 
Open
A really nice bag, I give it a full 5 gnome rating. Get yours today on Amazon:
I’m with you with a 5★ rating; I got one a few months ago & was so impressed with it, I got one for my wife as well 😃
Thanks for sharing!
Inderdaad die ie een heel mooie tas
Thank you.