Margawrote a review of Patagonia Black Hole 60L Duffel Bag - 3661cu in on March 21, 2017
This bag is great - I bought two, one in Black for my boyfriend and one in Nouveau Green for myself.
They have backpack straps, so you can carry it as a duffel bag, or add the backpack straps and wear it as a backpack. It's also the largest size bag you can carry onto a plane, which is why we went with the 60 L. The material is really durable and I can tell its going to last a long time and be my new go-to.
I went on a 10 day trip, hiking in the PNW and then to Hawaii and had plenty of room to pack everything I needed in it.