Let's say you're bringing Fido to get fit but shoving your wallet, keys, and cell phone in your workout clothes just won't work . . . what's a sporty gal to do? Grab this Bucchi Bag Convertible Dog Leash ($15) that's what. With a pouch big enough to fit all the above items (and pooch's poop bags, too), it snaps to the included leash on all sides, which makes it feel like an extension of your hand and causes less bag bouncing if you pick up the pace.
Then, if you decide to stop for a postrun snack, detach the lead to bring your valuables onto the table and loop the leash around a fixed object when you sit down.