SIS Marathon bag does for me, enough space for keys, a mobile, some change for a drink on a long run and the all important tissue paper for emergency use. It was about £7 I think. The pocket in the back of my shorts makes the loo roll and jelly babies go soggy and the look from a shopkeeper on handing him a soggy tenner, sticky with jelly babies and with bits of tissue paper stuck to it is to be avoided.