A kitchen splatter guard is just the right size for a backpacking stove windscreen. It costs $7 and weighs eleven ounces. A little heavy but a good choice for Boy Scout patrols.
It is tall enough to shield the flame of a canister-topper stove and big enough to leave room around the fuel tank so it won’t overheat.
A view from the top, showing the room for ventilation or bigger pots. Back in the 1970’s, my dad made a windscreen like this by bending some tabs on thin sheets of aluminum.
The one I bought is the Norpro Nonstick 3 Sided Splatter Guard. Each panel is 10 inches wide and 9 inches tall. The Amazon price varies. It cost $5.55 when I bought it. Similar splatter guards should be available at department stores or hardware stores that sell kitchen tools.