This item has enough space to store everything you need on the trip, including a first aid kit. I can store my wallet, keys, GPS, phone, garage door opener, knife, small first aid kit and more space. Magnets attach the bag to my tank without straps. I tested this thing at over 100 miles per hour and the bag didn't move an iota. Slim and stylish bag that doesn't take up much space. It's not big and bulky where it looks out of place. Very easy. Love it!