I've only used this bag for one road trip, so this is not a super detailed review. But it was excellent. Fits a lot inside while still looking compact and elegant on the outside. And the materials and sewing are very high quality. The shape is a little different compared to other duffel bags, which helps when packing and unpacking, and makes it more spacious inside.
With packing cubes it becomes even easier to fit more and more items inside. I'm using packing cubes from a different brand that I already own, but I'd imagine Peak Design packing cubes would maximize the carrying capacity.
My minor complaint is that the two handles don't attach to each other very strongly. The magnets are not strong enough. I know Peak Design knows how to make good magnets because I use their phone case, so I'm not sure why they're using weaker magnets on this duffel. This only applies when using the handles to carry the bag in one hand for 10+ minutes while it's packed heavy. Most people will use the shoulder strap in this situation anyway.
Another thing to consider is storage of this bag when not using it. A lot of competing duffel bags can be folded into a pocket for compact storage. This bag does not fold into a pocket, but it can be folded down flat. If you live in a tiny apartment and are planning to use this bag for occasional travel and store it while not using it, you'll probably have to store this bag flat above your wardrobe or someplace like that. It may fit into a large suitcase when flat.
Bought the 35L as an overseas flight bag when we want to avoid checking in luggage. Great option that works well with a combination of packing cubes and camera gear. As noted in other reviews, the magnets intended to keep the handles together are ineffective, but this is a minor issue for me.
This is the best duffel bag I have ever purchased. The only thing I would change is the carry straps, they are a bit finicky. The magnets aren't as strong as they can be, but this still isn't an issue, this is just something I'm being picky about. All in all this bag is great and I would recommend it to anyone planning on going on a 2-3 day trip!
I bought the Travel Duffel at the Black Week sale, with a medium and a small packing cube. Overall, I'm pretty happy with the quality of the materials, the pockets and how well it fits with the packing cubes. The shoulder strap is also super nice. I like that it's easy to get into the bag, as the opening is large. The multiple strap attachment points are also nice.
My gripes are with the carrying handles. They are uncomfortably thin, which you feel especially if it's heavy. There are magnets in the handles, which makes them stay together when you aren't using them. But as soon as you pick them up, they separate. I just ended up detaching the handles and I only use the shoulder strap.