Had the same environmental crush regret if the mean green 1# disposables. And where do you responsibly dispose of them?? Usually used about 3/4 of one per 3 day trip, running a two burner stove. $8 a pop X 6 trips = the cost of a 5# refillable. So no-brainer for us. Made the switch. Have chosen not to fixed-mount the 5#, since it easily ties down multiple locations, depending on trip duration and necessary gear load. Filled the tank, took three trips with 3-4 adults, and 2-3 kids. Our stove was the primary cooker. When I went back to fill it, was still nearly half full. 5# tank = ~1.25 gallon capacity from my experience