noun
pannier
Refers to a basket or bag, often one of a pair, used for carrying items on a bicycle, motorcycle, or pack animal. Also used historically for a framework worn under a skirt to expand it at the hips.
自転車の後ろにパニアを取り付けて買い物に行く。
I attach panniers to the back of my bicycle and go shopping.
ツーリング用の防水パニアを探している。
I'm looking for waterproof panniers for touring.