This bag has it all! It's very large which is a bit of a drawback on its style but it can hold just about everything you would want to carry in a tank bag. There are many compartments and a protected window to place your directions/map for easy reference. Although it comes with additional straps the magnets are more than enough to hold the bag secure at 80 mph and easy to remove when you dismount.
I purchased this bag to hold my cell phone, charger, maps and other small stuff I want to keep within easy reach. I still like old paper maps and the clear map holder is great. The bag stays put on my metal gas tank even at 70mph with just the magnets.
Really nice bag. Lots of room to carry stuff you need to get to quickly. Perfect size for my bikes tank. Magnets seem to hold strong. Not impressed with the quick pocket or the expandable bottle holder but still a really nice tank bag.