NOCO Boost Plus GB40 1000 Amp 12V UltraSafe Portable Lithium Car Battery Jump Starter Pack for Up to 6L Gasoline and 3L Diesel Engines

I bought one of these the other day for a couple of reason. The first is that even though I have AAA and Roadside Assistance through my insurance I do hunt in a lot of places that can take a while to get to and I thought these might keep me from being stranded for a longer period of time. 

The second is that it actually takes up less room in my travel box than the jumper cable did. Still hoping that I never have to use them.