Interesting, I've got a Topeak bag on my roadbike which is far too big & bulky. Thinking of swapping it out for a lighter tool roll.
Looking at the Mack Workshop a combination of their Road Roll (for puncture repair bits) and the Pouch (for wallet, keys etc.) could be just the ticket.
That's my setup. Tool roll fits in loads of stuff, like CO2 canisters, tubes and levers without any hassle. The pouch keeps any extras together in my pocket. I have my phone and some cash/cards in there and there's still space for another tube and multi tool if needed.
http://www.mackworkshop.com/shop/product/jersey-pouch
The Mack Workshop Pouch is one of the best cycling accessories I own.