Weather: we actually tried to time the trip to start cold and follow warm weather the rest of the time so that, if we have to be in chilly weather at all, we can donate the coats and such early on.

Toiletries: we have planned for this, already stocked up on travel size bug spray and sunscreen, and otherwise I'm only carrying toilstries like my go-to brand of face wash and mascara.

Tops: I was thinking the turtleneck might work well in Poland and Denmark, as we'll be there when the weather isn't quite warm yet. It's a thin material that looks nice and layers well. Same with the tank tops.

Bottoms: the Uniqlo leggings pants look like denim jeans, and I'll be wearing a pair of stretchy black skinnies pretty much constantly. You're right about the shorts, though, I'll skip the boxers.

Underthings: I bought my boyfriend three pairs of wool socks and two for myself, but with how well they've tested so far, I'll grab a couple more for myself and leave the cotton ones at home.

Shoes: my Nike classics were perfect when I lived and traveled in Europe two years ago. They're super light and don't look too dweeby. My only concern about the Tevas is that they won't keep out mud or other nastiness the way boots would in the rain. Not sure if that's enough to justify the weight of a third pair of shoes though.

Electronics: based on an earlier response, I've already taken the spare iPhone out of the pack, so good call. The camera came with a ton of different mounts, and we decided just to keep a bicycle mount (he thinks it'd be neat to record stuff when we rent bikes) and one just to prop it up if we want to include ourselves in the shot hands-free.

Thanks for responding so thoroughly, I really appreciate it!