Ask 5 people this question, you will get 5 different answers.
1st narrow it down by strapped or magnetic. I hate straps so that's out. Never get the tight enough, and the clips all break after about a year of use.
Magnetic is great option, on it goes. Arrive and off it goes. Easy.
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A bunch of us have the Bagster, myself included. Not cheap but they look and work great!
It must:
Have a large map holder.
It must be able to carry 2 Venti ice coffees from Starbucks.
It need to be comfortable so as to be used as a pillow to rest my head on long highway rides.
It must look stylin like the "Busa".
Got any pictures of something that fits my needs?
i really like my rapid transit recon 19 (with optional hydration bladder). All depends on what you need one for. I don't regularly use a tank bag, but when i do, it has been perfect for my needs and i like the design. It's magnetic.
rapid transit recon 19 magnetic tank bag :: New enough