"The Patagonia Black Hole 40L Duffel Bag is sized for the trips that fit in a carry-on: a long weekend, a quick work trip, a few nights on the road. The TPU-film laminate over the ripstop shell and the PU-coated lining work together to keep contents dry when the bag gets shoved under a wet overhead bin or dragged across a rainy tarmac, while the convertible padded backpack straps give a hands-free option when the walk from the terminal gets long. What Our Gearhead® Experts Are Saying:""I grab this one for any trip short enough to skip checked baggage. The 40-liter size slides into an overhead bin or under the seat without a second thought, and the padded backpack straps make the walk from the gate to the car easy."""