Re: seriously, only a cloth diapering stay at home mama's dilema ;) (stash??)
That looks like a good amount because there should always be some dry (you have enough to have extras so no sense of laundry desperation! LOL). I think the BUmmis pants are actually laminated nylon, so might be more breathable than PUL....but you should be able to squeak by with just 2 of them as they would like airdry in the time between changes if you just washed in the sink. I used to have a Bummis original cover and it airdried in 20 min from soaking wet.