One of the best wheeled bags I’ve seen, very strong and reliable. Excellent handles for carrying the bag as well. 

Does not say anything about how many litres it holds Berghaus thinks we should guess the litres

I bought this bag for a trip travelling around Costa Rica. As I was travelling by plane, bus, car and boat, I decided a holdall with wheels would be easier. The Mule 100 was perfect. I had plenty of room in the bag for everything and the zip compartment at the top was really useful. The bag is of really good quality and stood up to being wheeled, dragged and thrown over 2 weeks. I wished it had a long strap too to help carry down steps (like my husband's North Face bag). but that's the only down side. I definitely recommend this bag.