My Origo 1500/3000 instructions say the canister holds approx. 2.5 pints, 1.2 litre. I pour some fuel from the gallon can into a small drink bottle. I have a soda bottle with the pop-top like you see on sports drinks bottles or, what I use, from a dish liquid bottle. A small part of the mesh screen is pushed in, so I stand the canister up on edge with that screen recess on the bottom. Using the squirt top, squeeze the fuel in until it fills up to the rim of the opening. Laid flat, it works great.