Any ideas out the for chair / back support on multiday kayak self support trips? Kayaking all day and sitting on the ground at night is hard on my lower back. Saw one of the guys in a bomb flow video sitting in what looked like a crazy creek camp chair placed on top of an upside down kayak. Got me thinking a nice chair or seat would be great on a multiday. Any thoughts or experience? I use a big Agnes air mattress so the therma rest rig up contraptions are out.