I'll second the Topeak range. I got the Wedge for my road bike, I think it's the micro version and it is small, discreet and just fits a multi-tool, tube and levers with room for a bit of cash and a chain link. Pump is clipped to frame next to bottle cage and anything else goes in pockets (phone and...... well, just a phone really)
EDIT: looking on the web it appears it is an Aero Wedge mini with quickclip. The quickclip is a really good attachment that clamps to the saddle rails and allows other size bags to be swapped depending on the rides requirements.