The deep black of obsidian, a material found in nature, is expressed in this color. The goal was to create a color that gives a sense of depth within the achromatic world of black. Medium is the checked baggage size. Recommended for trips of 3 nights or more. Does not include a laptop pocket. Features: Durability to continue long journeys - So that journeys are safe, Moln conducts eight varieties of factory testing and ships out only those products that clear all testing. Quiet and strong casters - Casters are made by Hinomoto Jomae, Ltd. and boast low noise and high durability. They are sturdy on stairs and steps, and allow for smooth movement. TSA lock - Equipped with a TSA lock that is approved by the U.S. Transportation Security Administration, for reassuring travel to the U.S. Trolley handle - Equipped with a trolley handle that is adjustable to the desired length. It can be adjusted to the optimal length according to a person's height or to a given situation. Synthetic leather front - The front pocket is made of synthetic leather that is resistant to dirt. It is more durable compared to genuine leather, and is water repellant making it more stain resistant.