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Well there are front rollers up front so they are small. The dry bag on top has my sleepingbag in it so that's also not heavy. I was thinking about adding a rear rack and back rollers but that would already be about 2kg extra. Also I weight about 200 lbs so if I put all my luggage on the rear it will put a lot of load on the rear wheel, now its more evenly distributed over the wheels.
I did touring with my fixed gear one time with only a rear rack and I hated the handling, this setup handles way better.Tl;dr I wanted to be on radavist
Don't get why everyone's allergic to rear racks. They're for carrying the most weight, low-riders are small bags for a reason.