This bag clicks onto your bicycle rear rack, but also has a shoulder strap for toting. This is made for groceries, but works perfectly for books and bags.
Like new condition. Sells for $54 on Amazon.
Amazon description:
The mesh-sided Grocery Bag cycling pannier is the perfect bag for riding down to the store for light shopping trips. A standard paper grocery sack fits perfectly inside or, better yet, save some trees and throw the bag over your shoulder using the 15 inch shoulder strap (included) and use it as a shopping bag. Total Volume: 1294in3.
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