Joined: Aug 2010
Posts: 12,727
Likes: 2,105
From: Madison, WI
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
I hate to tell you this but they have been around for many many years. (Maybe 20 plus years?) I have used one for sleeping bag and another for clothes for most of my trips and I think I have at least eight of them of varying weights and sizes.
I like the Granite Gear ones best. I have not tried any of the new waterproof ones with air valve but I have not had a problem with mine when I use waterproof panniers and bags.
After a trip and after sleeping bags are well aired out, I store sleeping bags in large cardboard boxes stacked up in the closet so that they are nearly fully lofted for long term storage.