I like the Ergon BC3 I got (especially at $80 from competitive cyclist on sale). I wish it held more than the 27L or whatever it holds, but I like the waist strap and the way it moves with me. Not bad, but not great when it comes to ventilation.
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"