I've tried to CD on vacation, but it just didn't happen for us. LOL. We brought back some wet diapers, it wasn't pretty. Plus, I wouldn't trust doing my diapers somewhere where there might be fabric softener...I made that mistake with a drier once and my diapers repelled for weeks! Plus, I'm not paying to bring diapers with me with these crazy new airline fees.
The flip inserts are still narrow, I think. They're coming out with wider ones. If you don't have a heavy wetter the narrow ones should be fine and you can find really good deals online if you google is. DD pees more than anyone I've ever seen and she leaked with them.
DS hated disposibles. He would scream and cry if we tried to put one on him and beg for his "nice soft diapers".
This was our solution for him, and what we do with DD on vacation as well:
Buy 7th generation diapers, a size smaller than needed (cheaper!). Use a size smaller cover than usual...or a one size cover snapped on a smaller setting. You can use your bumgenius pockets like a cover. Just open the diaper and lay them in the cover like a prefold (or flip insert, or whatever you're familiar with), you can open the back if you want to, you don't need to. Fasten cover as usual.
For DD who has sensitive skin, (and for DS when he still complained) we lay a fleece liner (you can make your own. Go buy the cheapest fleece you can find and cut it into rectangles!) on top of the disposible, because her skin is wetter in disposibles than in prefolds with a fleece liner. Fleece washes and dries in about an hour in the hotel room, so you only need enough for one or two days, or you can bring enough for the whole trip if you want. I just carry a wetbag for covers and fleece, but that's nothing compared to CDs. Absorbancy of a disposible, feel of cloth for baby, not too bad on the chemicals with 7th gen.
The only downside: We're going to end up taking a lot of vacations during DD's first 3 years, and I think we'll end up spending as much money on sposies as we have on our actual diaper stash, which is completely rediculous.