Powerdyne Bearing Tool
Rather than popping your bearings out with your axles, and causing them to torque, you can use this tool to pry your bearings out, and to press new bearings back in. Since it leverages the bearing out by slightly bending the hub of the wheel, it cannot be used with aluminium hub wheels. If you try it, you'll probably get your bearing jammed in there at a funky angle, then you'll be sad.
Great for nylon hubs when you're on the go. If you have metal hubs, get the PowerDyne Bearing Press/Puller