First of all: without the supplied accessories, especially the Giestülle metal canisters were only adequate. With Giestülle the spout is sealed and sufficiently flexible. The funnel is a nice little bonus, unfortunately, the outlet is extremely small, so that the flow rate is more than modest. Only the lack of ventilation of metal Giestülle must be compensated when pouring through shaking / moving the canister, but is easily doable. Otherwise, the canisters are sealed, only very slight smell of petrol exits.