Material: Fabric (outside)
U-lock will have a pouch to carry the lock.
The pouch has a velcro that can help the lock don't fall out,and it's custom-made,
you also can choose the pattern for the pouch.
You can tie the lock under the seat,and the pouch also can carry
other small stuffs.
You also can tie the U Lock with belt or the strap.
It's very easy to carry.