My very old and heavy jumper box stopped working last year and I had to buy a new one.  I bought a 1,000 watt one from Harbor Freight.  I have only had to use it once to jump start a nephew's Ford Escape - and the little jumper box started it instantly.  I have used the jumper box as a charger box when camping to recharge my phone and helmet radio.  It is amazing that this little light weight gizmo can start a full size car when needed!  After seeing it work my wife decided I needed to buy one for her car.........we still have jumper cables but never use them!

https://www.harborfreight.com/1000-peak-amp-lithium-ion-jump-starter-and-powe...

https://www.harborfreight.com/2000-peak-amp-lithium-ion-jump-starter-and-powe...

I have a Noco Boost XL (amazon). Charged it , put it behind the seat of the truck , at least a year later. Working car ship in Oakland I smoked my 50 lb company supplied jumper. At break went to my truck grabbed the Noco , after being uncharged for a year , it started 16 cars & trucks before it died.
It’s 5 years old still starts a dead car no problem. And also have a tire inflator too. It makes enough pressure to bead a m/c tire. Both in a small go bag , behind the seat.