I have the crew drop bag and the roll bag and love it. We got this one as a birthday gift for a friend of ours, she was so excited!
Roll drop Nails it! Currently I'm using mine for hydration and nutrition but I've used it for socks/gloves/glasses and other combos. Love this thing!
This is my second (passed one on to my son for his races) and they immediately became our favorite bags. We use ours primarily as day/weekend trip bike bags, but they have doubled for an Oregon coast beach day, extra travel bag etc. We are spreading the Silo bag gospel to our cycling buddies!