Something I am curious about.
Last year a buddy and I climbed Rainer via the Ingraham Glacier. We spent three nights (including part of the summit night) in the public shelter, so we got to see how a lot of other climbers equipped themselves for the summit bid. We were surprised the first morning to see that all the climbers had left their sleeping bags behind on the shelter's sleeping pallets. I had always been under the impression the most dangerous aspect of climbing Rainier was the possibility of a sudden change in weather, so for our summit day my partner and I carried our sleeping bags, half-pads, a stove and everything else we thought we might need for an emergency bivouac. We assumed this would be standard procedure. But clearly it is not.
How common is it for summit climbers to carry sleeping bags to the top?