Holds its own.

Verified Buyer Reviewed by Kayla from Wisconsin on Wednesday, July 6, 2016
I'm really happy with this bag. I bought it for a recent trip I took to Alaska. We traveled with all of our backpacking gear, and this bag totally rose to the occasion.
I packed it FULL. I managed to fit a 35L backpack, sleeping pad, sleeping bag, boots, sandals, clothes, dehydrated food, wool poncho, and some Ziploc's with toiletries. It was tight, but the zippers, handles, and material held up even after being tossed around the airport.
The backpack straps are as simple as they come. No padding. But they make a big difference when you have to walk a longer distance or need your hands free.
The bag is not waterproof. There is a seemingly waterproof material lining the inside of the top, walls, and bottom of the bag, but none on the ends. It could probably handle a light rain, but that's about it.