The North Face Base Camp Duffel Bag, TNF Black/TNF White, Large

Fits all my stuff! Pretty water proof. I use it as a chair sometimes when traveling and love the backpack straps. If you have see someone traveling, they usually have the medium. That's the best size for carryons, but this is good for long trips and you can squish it down/tighten the straps and it fits as a carryon too.

I've just purchased this North Face Base Camp Duffel (Medium) for short trips and weekend travel, and so far it has been awesome. The material feels really tough and durable, the inside has a durable water repellant layer and holds up well even when it gets tossed around in cars or airports. I like the backpack straps too. They make it much easier to sling over my shoulder and carry when the bag is full. Plenty of space for clothes and other gear, and the wide opening makes packing simple. Definitely a solid bag that I expect to use for years. Will see how it holds up over the long term, but this bag is replacing one I bought 25+ years ago which has worked really well over this full period.