Originally Posted by
fietsbob
Want a single back pack/pannier? , Nashbar sells one. sewn in Asia.
there is an Ortlieb Bike Shopper pannier, sold singly,
+ they sell a back pack harness to clip the bag onto,
Advantage Ortlieb is waterproof, Shopper uses a waterproof zipper closure.
You could also pick up a set of Axiom Lasalle Panniers, which now sports a shoulder strap. Run with one on the left side for a while, then switch to the right. A set of these panniers are still less than one Arkel Bug and they are very durable as well.