The Rjays Deluxe Magnetic Tank Bag features:

Expandable main luggage area with collapsible support walls for when expanded
1 zippered change pocket & Velcro map pocket
Reflective piping
Carry handle
Adjustable rain cover
Single point quick release steering head safety strap
6 super strong magnets in base
Non slip rubber base
34cm long x 25cm wide x 20cm high (expands to 36cm high)