I tend to switch bags depending on distance and weather. I need a bigger bag to be able to put extra clothes as I am doing a big 3 day climb with lots of weather and tons of climbing early next spring. It is supported but the elevation changes, along with early spring makes me believe I'll need to be able to have a good array of things on board. I don't want a rack, so panniers are out. I might conside a handle bar bag, but would really like to see what you people have for larger seat bags.