Apple watch charger cable

I have a 38mm apple watch 2.  All you need to know about this charger is that it works great, it has a long cord, and it plugs in with a USB end.    I bought a 2nd charger so that I can keep it  packed in an overnight bag and dont have to try and remember pack my charger.  I love my apple watch and how it keeps me informed about everything that is happening on my Iphone, so I definitely don't want to let my watch battery run down.  Small price to pay for peace of mind.