For anything you carry, the number that decides it is usable watt-hours per pound — and both halves of that ratio have been independently measured for every unit we cover. The counter-intuitive result is that bigger units carry better, because the case, handle and inverter weigh much the same whether they surround one kilowatt-hour or two.
The best power stations for camping ranks them on exactly that ratio. For a full-time build, vans and RVs weighs capacity against how fast you can refill it on the move. And if the reason you are here is a medical device, the best power stations for a CPAP works out nights per charge with the humidifier accounted for — the setting that halves your runtime.
Whatever you are sizing for, the load-math guide turns your actual kit into a watt-hour figure.