Not everything is going to fit in those jersey pockets. In those instances, you're going to need a decent saddle pack. The Timbuk2 bicycle seat pack brings all the rugged durability you expect from Timbuk2 messenger bags to the under the saddle arena. It's tough and has plenty of room for all your on-the-road essentials.
Velcro strap attachment makes it easy to slap it on your bike and go
Ballistic nylon exterior with rubberized piping for a durable, weather-resistant construction
Key-ring tether helps you keep track of your stuff
24 cubic inches of space so you can bring everything you need for a day on the bike