This is my second Ruffwear collapsible dog bowl (ex-wife kept the first one), and it is a great product. The product itself gets five stars, but I took one star off due to the price.
I considered getting a smaller collapsible silicone bowl on Amazon, primarily because they are 1/3 of the price, but decided to get this one instead because it is larger and can hold a whole portion of dog food when it is expanded. I also considered the Ruffwear soft nylon dog bowl with the drawstring closure (which I've used before), but decided this was better because it can be used for water or dry food, and is thus one less item to carry. For a backpacking trip of a few days, I'd be putting the dry food in a zip lock anyway.
It is durable, and has a non-skid bottom.
It also comes with Ruffwear's warranty, which is great.