This is my first time going with one still in diapers! We'll have two strollers with us, so we should have some storage space in the baskets and we'll be wearing magic bands. I will need to carry epi-pens, DS' glucometer and blood sugar emergency stuff, and inhalers. Otherwise, just typical storage needs for one in diapers. I like to have my hands free, so I want a backpack or slingpack, but the MOST important part is that I don't want it to make me hot. Any ideas? What kind of bag do you use at the parks? TIA!