Depends if your Staying in, Driving out, or Hiking out! Because that's what's going to determine what and how much your going to take or need.
this is true, if your staying home, then you can have as many as you want. If your bugging out, then weight becomes and issue as you hike to your bug out spot. I keep 10 for my AR and AK. 4 for my sidearm. I buy more of them when i see a good deal for later trading. but I keep 10 loaded and ready at all times.