On long trips I like to carry a DSLR and a 70-300 Zoom. I've tried all kinds of systems from a harness to hold the camera against my chest to two different baskets and have purchased 5 different handlebar and racktop bags for the task of keeping my gear handy yet protected. The Dayliner is the best solution I've come across so far. Internally, it's padded and just wide enough to accommodate my gear with lens hood in place.

I'll be using it in conjunction with a Jack Rack [Google it, it's a revolutionary design] and adding extra padding to the bottom to take some of the bumps out of the road. I was hoping for a truly waterproof solution, like a kayak dry bag but the Waterproof Backed 600D Polyester will be a good start. It comes with an additional waterproof cover but I'll augment that by bagging the gear in heavy plastic in a downpour. I wish it had a built-in iPad sleeve but I should be able to figure out a hack.

To the folks at Two-Wheel Gear: do some googling around. The number of riders who are searching for a proper bike camera bag will blow you away. You are definitely on to something. It should be a piece of cake to do some guerrilla marketing to those guys. This is a completely workable solution.