Cared-for ULA Catalyst backpack. 75 L, 44 ounces. Also works well as a day pack as seen in the Death Valley photo.
Lots of space for a BV500 canister to go sideways. The size is medium, which is large for me as I have narrow shoulders.
Pack is a couple of years old and done 7-day sections of the JMT. It is strong and sturdy with great straps, not tiny ones that want to break.
I wrote my name on the purple Robic, but it's hardly visible. I wanted to get my pack back in case of theft.
Cost new is $343 which includes tax. I'm asking $250.