The bag is constructed of 1000D CORDURA® nylon, which has excellent durability, but is not waterproof, so when using it on rainy days, you can protect your luggage with a dry sack or bag cover. We recommend this. 

The main compartment opens with a large zipper opening like a daypack, so you can easily put in and take out books and PCs as well as a change of clothes. Additionally, because it has a handle, it is easy to carry when entering the workplace or shopping.