To minimize the risk of needing to jump start one of my cars, I just change out my older batteries with a new one every 3 years, or sooner if I start noticing slower starting power. I do carry jumper cables too but mostly in-case I need to help someone else get their cars started. I can't ever remember needing to jump start "my" car while on the road by doing this... It could happen but far less likely. But that works for me!
Realize also, that a a battery jump pack or even regular jumper cables are not a guarantee you can get your car started. They won't be of much help in many failed battery conditions. Examples: Shorted battery, bad, loose or severely corroded connections, etc, not to mention other ignition problems.
I'm not sure if I've ever seen a battery pack or even jumper cables that are idiot proof,
although they seem pretty simple to me, "admittedly as a car-guy"
. So If you are going to use any of them, learn how to before you need it. (Same as folks should with changing a flat tire, or any other basic emergency repairs.) If you are not comfortable with this, then maybe getting help is a better option.
But with that said, a battery pack is okay and could be useful, especially if it makes you feel better. Just somethings to think about.