I've used the one in my daypack twice, sleeping out under a poncho both times. I had a couple large contractor bags under my AMK bivvy. First time just used them as a ground cloth, second time stuffed with some soft stuff to cushion and insulate. Both times I was able to roll up the AMK Bivy and get it back into the bag with room to spare. I would suggest that when you get back home, you unroll it and air it out. Your perspiration can build up inside.