Thumb Score: -1

This could be the cheapest Laptop Sleeve made with water resistant materials, found at Amazon with price $ 8.99.

Link: Laptop Sleeve Protective Case Cover Carrying Bag [amazon.com]

Good fit for laptops and ultrabooks with most of 13 13.3 inch like Acer/Asus/Dell/Fujitsu/Lenovo/HP/Samsung/Sony/Toshiba, may not snugly fit all computers due to variations in the sizes of different models.

Internal Dimensions: 13.7" x 0.78" x 10.2" (LxWxH)
External Dimensions: 14.5" x 0.78" x 11.2" (LxWxH)