Works on a bicycle as well as on a scooter and somewhere to put a key, patch or whatever is desired. Can be adapted to different sizes and different covers. I made one but you can also do two like here on Pinterest.
Pattern: I made my own version of this Cute Bike Bag Pattern (Thank you for sharing♥)
Crochet hook: 3,5
Gadgets: Made it personal with my self-designed button