Some of Harley's leather is stiff but this bag is super soft and supple and would be really comfortable attached to your belt loops. It is a nice size and would even hold a wallet if you didn't want to transfer everything to this wallet. It does have credit card slots and a zippered pocket inside. 

It measures 8" wide by 5" tall. It would expand to about 1" on the bottom and probably 2" in the center.