I bought a Topeak medium aero wedge thinking I would use it to haul some of my things around on some easy leisure rides/commutes. But I can't get the thing to actually fit onto my saddle. I've got a stock Jamis Coda Sport which has a "Jamis Touring with SL top and satin steel rails" saddle. When I have the aero pack clip attached to the saddle the pack is squashed really tightly up against my seat post, plus it blocks my tail-light mount.

So I think I'm sending it back but now I need something to haul around:

Treo 650 (largish cellphone)
Alien II multi-tool
1 spare tube (700cx28)
1 small patch kit
keys & wallet would be nice but not necessary

Any ideas? I put a Topeak explorer rack on the back where I've got my U-lock stashed at the moment.