Cloth diapering with prefolds away from home?

I've been cloth diapering for nearly 3 years now, starting with my daughter when she was a toddler and now with my son since he was just a newborn. At home we mostly use prefolds or fitted diapers with covers. I have a variety of pockets and AIOs that I use when we're out of the house for convenience. Lately I'm finding that I have a LOT more leaks with the pockets and AIOs. I usually put two inserts in the pocket diapers - any more and they'd be ridiculously bulky and not fit correctly. At 20 months old, my son can easily soak through them in less than 2 hours and as soon as the inserts are saturated it starts wicking through to his pants. So either I have to make sure he gets changed every hour (which is a real inconvenience when we're not home!) or carry several extra pairs of pants along. This problem is not with one specific diaper brand - I have several different brands of pocket diapers and AIOs, including home-made ones, and all of them do the same thing. We are NOT having this problem at home with prefolds and covers. Even when the prefold is fully saturated, it doesn't start leaking right away. I can leave him in the same diaper for 3-4 hours during the day or all night long and it doesn't leak.

Because of this, I'm thinking about getting rid of my pocket diapers (which I hate anyway - unstuffing a wet or dirty pocket diaper is just nasty - and I have a friend who would love to have them) and using prefolds and covers all the time. Anyone out there doing this? My concern is what to do with the used but not soiled covers in between changes when we're out. At home, I leave the covers lying out on the changing table where it can air out a bit before being used again at the next diaper change. I can't do that so easily when we're out with just a diaper bag. If I stuff the cover into my wetbag with the rest of the diaper, it's going to be even nastier when the next diaper change rolls around. I feel like I would need to just keep using the same cover even if it's smelly and needs to air out, or carry enough covers to use a new one each time and just plan on washing them all before using again (which would probably require buying a few more covers).

Anybody out there have a different solution? How do you cloth diaper when you're not at home?