I've kept mine deflated and tightly rolled up for the past 10 years or so. Guess I forgot to read my Therm-a-rest instruction booklet Over that time, I've used it monthly on overnighters and for a yearly weak long hike in the summer. It doesn't self inflate anymore, so I have to blow it up manually now, which doesn't take long at all. Aside from this minor inconvenience, the mattress still keeps me warm, is still very comfortable, and has given me no other issues.