This is the Giant Bicycle Classic Folding Backpack. This foldable backpack has a small pouch which it folds into for tiny pocket-sized convenience. When you need to carry some items, simply unfold the pouch and Voila! You have a water resistant backpack. 

 

Features: 

 

Foldable backpack fits jersey pockets.

Lightweight and high volume.

Water repellent and durable 70D nylon fabrics.

Wide open zipper.

Adjustable shoulder straps.