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I agree. Mine is tiny unfortunately which is a real pain in the arse; it just barely fits a waterproof and small amount of food. I'm after a new frame though and once I get that I'll probably get a much bigger bag that will fit in both of my bikes.
I like the idea of top tube bags and stem cell type bags too for food that you can eat as you're riding along. I was going to try to bodge something out of a climbing chalk bag but not got around to it yet.
I would also say you want a big a framebag as possible, it's the least annoying bikepacking component. all the heavy stuff in there, then light squishy stuff at the back and front