Chestnut Hill - Convertible Tech Backpack, Laptop and Messenger Bag. VERSATILE BACKPACK : Multiple uses in one versatile backpack/messenger bag, made from durable 14 oz. 100% cotton canvas. SHOULDER STRAP : Use backpack straps, carry handle, or removable shoulder strap to transport. TO CARRY : Handy side pockets on outside to carry water bottle or other beverage. USE : Dedicated padded & zippered pocket to store laptop or tablet, several pockets & pouches to store and carry accessories. SIZE : Overall measurements are 11"W x 15"H x 3 1/2"D.