I'm more a frequenter in the SS FG threads but I figured I'd post this question to the guys that haul all sorts of stuff.
My bike isn't drilled for racks/panniers and I'm looking to get a fairly easy on/off type rack system for the days to work that I want to actually bring enough food/clothes/etc and not have it on my back.

I've seen seatpost racks but they are only rated at 25lbs.

Has anyone had experience with the Knog Rackless Pannier bags? Or does anyone have better suggestions other than get a second bike?

PS...On any given day I carry a widescreen laptop/cables, clothes, food, and some basic tools on countryish roads filled with gravel and bumps so I need a fairly stable system...