The new bags from Performance, particularly the "TransIt Waterproof Panniers" look pretty good. The copy in the catalog is spectacularly unhelpful, but it appears the bags can be rendered waterproof or left to breath a bit if contents are damp. They look well constructed, and they're a steal at $60 a pair for large rears. No mention is made of the mechanism used to attach them. Just wondering if anyone has a set yet. It's too soon to talk about durability, but two sets of these would still be less than one of Arkel or Ortleib's bags.