Soooo - I'm confused. If a bike jersey doesn't have pockets, what makes it a bike jersey? I know I see them in catalogs, but it confuses me. Some of them look boxy, too, so why aren't they just t-shirts?

I agree on the "under the gripper elastic" method. I carry my car key there sometimes. Ultimately, I would recommend the purchase of a new jersey, at some point. If you have bulkier items, maybe a baggie pinned somewhere? I know someone who tried making a Shot Block necklace for a ski race - not as ideal as one might imagine. It was a hilarious story. I believe they melted into her hair.