I used a cheapo pricepoint.com sette generic bag for 5 years and it worked fine. The shoulder strap started tearing this year and I've been using a zip tie to hold it together so I've been looking for a newer one. I just bought an osprey raptor 10 for $95 and the quality is night and day different. I haven't ridden with it yet, today will be my first, but I expect it to be more comfortable. If you are just getting started and don't want to blow a lot of money though a cheap bag will work.