Your small amount of stuff can and will easily fit into pockets.
Unless you have one of those big wallets that a lot of people seem to have.. although, those are more of a clutch, in my opinion..
Anyways. I carry that much, and more, in my pockets.
Except my keys.
Those go on my wrist, they're attached to a puppy collar. Simple way to keep up with them. c:
If you must carry a bag, then maybe a messenger or a backpack, or something like that.
Also, I've never really seen women's pants with small pockets, except the ones for thinner women.
all the pants i've ever had had okay sized pockets.. some were huge.