I second the Camera I/O Mini insert for backpacks.
Deliver on the load bearing padded waist belt for the Guide's Pack.
A two strap backpack that will convert into a messenger bag - like the Tri-Star and Aeronaut, but more commuter versus travel oriented.
Upgrade the Synapse 25 to include a frame sheet.
Tom Bihn Umbrella - come on, you guys are based in Seattle where it rains all the time. Plus, I know you'd build an awesome one.