This bag is perfect for the kind of hiking I do. Often, when out on the trail, I need to identify some flora or fauna I find interesting. To do this I carry field guides. I know, I know: all the guides are apps now, but I find the old fashioned books more reliable. Often one cannot open the apps on the device of choice, because you are too far out to get a signal. This messenger bag is perfect for bringing your guides with you. It is stoned washed canvas and only weighs about 12 ounces. It is fitted with 3 compartments inside, and one outside with double snaps. The main compartment dimensions: 15″ x 7.75″ x 1.5″ and the Front pouch dimensions: 7.75″ x 7.75″ x 1.5″. It has an adjustable strap 51″ x 1″ with 10″ x 2″ shoulder pad. This bag is perfect for anyone, be it the seasoned naturalist, or the beginner wander. Also, if you collect things you come across in your travels, this will do perfectly. I have often found specimens I want to take home with me, and I was glad to be carrying this. You can pick one up for under 25 dollars, and it is worth every dime. It is machine washable and easy to keep clean. I highly recommend this product.