http://www.sportsmansguide.com/net/cb/cb.aspx?a=535681 I've got one of these, found it at a surplus stores a year or so ago but sadly never found another till now (too late, as I've already used a Pelican set up on the Strom), but these would be a great medium-sized pannier. Saw this and thought I'd pass it along. Not only are they incredibly tough and perfect sized for thumpers up to bigger dual sports, but they're light and air-tight (even have a pressure release). They also have a cable lid retainer which is great on a side-loader. For under $100 a set, would make a heck of a set of boxes.
