I have a Bagallini that I used in 3/07 when we took DS 1 1/2. We never brought an extra change of clothes for him but it did nicely hold the days supply of diapers, a wipe caddy, sunscreen, band aids, hand sanitizer, 3 Dollar Store ponchos, sippy cup, Cheerios container, and camcorder in the main compartment. On the strap, I carried my AP, debit card, and cell phone. (yes yes, I know they shouldn't have been stored together.....) My only complaint was that it got hot under the front strap and I had a permanent sweaty spot between the girls. We'll definitely be using it in June. DS will be 2 1/2 by then and we can travel light!
DH and I went in 12/07 but w/o DS so I scaled back and used only my camera bag. We also learned that we hate our camcorder and are much happier with our Canon S5 that has video capacity. We could've saved ourselves some $$ if we'd figured that out sooner! So go Canon S5 users!
I have a great shot of me wearing the bag but it's got DS in it and call me weird, I don't like posting pictures of my kids on a public forum. I'm normally not paranoid, just about this, actually.