My dad got us Floating Fishing Landing Nets, and they have been very useful on our fishing trips. We took them with us to the Wind River Range, and because they are lightweight and collapsible, we could easily attach them to our backpacks. The fishing net only weighs a little over half a pound. We also got magnetic bungee clips, which are convenient for clipping the net to your pants while you're fishing. You do have to be a little careful with the foam handles, but otherwise, they have worked great, especially for the price.
We used to use the small black nets from Walmart because they were lightweight, but they were too small.
I also took one with me on my trip to Flaming Gorge, where it was useful for landing the big rainbow trout they have there. So, it can fit some pretty big fish in the net.
These fishing nets collapse down to be easily attached to or carried on your backpack. They only weigh about 12 ounces.
I highly recommend getting one of these nets for your fishing adventures!