So they're definitely good for 1.5l nalgene bottles.

dh024, are you running your Ergons opposite ways?

I have a pair of dry-lights that I plan to use in the rear, but want to try two cargo cages on the fork. I'm hoping that and a frame bag will be enough for a short bike-packing trip. I might use a trunk bag if need be, since I have one of those on hand.