I too have 2 in diapers. I personally have the JuJuBe BFF. I was originally going to get the Be Prepared. However, I do baby wear so having the back pack option is nice. I currently have it packed with my DS's hospital stuff and it can hold a lot. Like right now I have a wetbag, 4 Lil Joey's, stick CJ's, hand sanitizer, chapstick, socks, mittens, Baby Legz, 5 kimono shirts, 2 outfits, 2 little hats, 2 recieving blankets, a minky blanket, a warmer blanket, and 2 paci's.
So I have a ton. It's not even as big as the Be Prepared and can fit all of that.