I like weight lifting and mostly work on Polaris Rangers and ATVs. I used to use small canisters with a pump to fill up differentials and transmissions, but they were a problem because they don't move much fluid. I've been using them for a few months - they're great for filling hard-to-reach containers, they're durable, the big red pump handle makes them comfortable for your hands, and because they're clear. You know how much liquid is left. I'm damn happy with them.