I’ve got 3.
Bontrager rapid pack. My favourite of the 3 for short rides, but minimal. Just space for some tools, a tube, a thin jacket or gilet. Bottle holder unnoticeable even with a full bottle. You need a pump on the frame or co2. Very stable and comfy, which is why it’s my favourite.
Osprey savu. Is better for longer rides, a bit more space e.g. can get a thin warm layer in. If both water bottles are full, is a bit uncomfortable until you drink some of it!
Tera nova PSA one. Best for bulky things like warm layers or bringing food. Has a pocket for a bladder but I prefer bottles so don’t use it for that.