Scicon TransAlp 2.0 Bicycle Pannier/Backpack
This unique transport system functions as both two small 10.5 liter bicycle panniers, and one large 21 liter backpack when walking around on foot. With rain covers for the panniers and a comfortable backpack design, the Scicon TransAlp 2.0 is a great product for both bicycle commuters and tourists alike.
I only used these a few times.