Lenovo ThinkPad Essential 15.6 Inch Backpack Eco Notebook Case Black The ThinkPad Essential 16-Inch Backpack (Eco) is a refresh of our popular essential backpack - with an eco twist. Engineered to provide unmatched value to those on a budget, itís perfect for work, play, and everyday life. With a 16-inch padded notebook compartment, ample internal storage space, and two additional front zipper pockets, youíll enjoy plenty of room for all your essentials.