I'd like to piggy back on this thread. We have a 10 month old and a 4 year old and are renting a double stroller. DS4 only sits in strollers at home for big walks or day trips, and after a significant amount of walking. DS10 months easily sleeps in a stroller, DS4 hasn't for years. So based on this scenario, would you buy 2 stroller fans or 1 to share. We'll be going in September (hot hot hot), but have no real use for this in our everyday lives (Canadian, lol). Thanks so much!!!!