BITD (way back) I did a fair amount of light touring on my track bike. To be clear, in that era there weren't "street" fixies, except of home road bike conversions. So those of us riding rixed were mostly riding TRACK bikes with track geometries.
I never liked carrying any weight up front because I felt it added more polar inertia to the steering axis than I felt happy with. I'm not saying it's material, but it was for me. So, I carried my load as close to the saddle as possible, so the bike had similar seat of the pants handling properties as when bare.
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