While I don't have Profile cages on my Sherpa (it uses CatEye nylon cages), I have had one in the past and found the dimensions the same, so here's a list of what's gone into mine on occasion:
- wadded-up rain jacket
- wadded-up woolen jersey
- Shoe covers when it stopped raining
- .75l water bottle
- 1.0l Zefal Magnum water bottle
- SOMA tool bottle (plastic bottle with screw-on lid to hold tools)
- Cage Rocket cell-phone holder
- Underseat tool bag (the small one that otherwise clipped to the saddle rails)
- Sack/pasteboard container containing Chinese take-out meal
- Lidded styro cup of hot coffee or hot tea
Best,
Dan.