Not as four-dimensional as it looks

Well, OK, it exists in time.  The angle I took this at manages to make it look like it's having trouble with the existing in space part.

Tubus Carry rack, via Peter White Cycles; Arkel GT-18 pannier, via my inestimable local bike shop, Cycle Solutions on Parliament.  And they fit!  They fit like they were made to fit!  (Even if I might want to tighten the bungie up a bit.)

This is one of those extremely cheering things, when one was guessing based on dimensioned drawings and hope.