There are portable power packs, and then there’s Anker’s PowerHouse. It’s about the size (7.9 x 6.5 x 5.7 inches) and weight (9.3 lbs) of a concrete construction brick, so might weigh things down a bit should you decide to toss it in a backpack. That being said, what you’re trading for that all that heft is a massive charging capacity. At 120,000 mAh, the 434Wh behemoth is able to fully recharge a laptop 15 times over. For reference, an iPhone 6 Plus has a 2,950 mAh battery. It outputs all that electricity through a 12V socket, an AC socket, or 4 USB-ports. It’s meant to take with you when you’re off grid and power your electronics for long periods. The PowerHouse is able to feed most things, like stereos, TVs, and lamps, but it might choke on higher-voltage appliances like toasters or hair-dryers. Still, no one is expecting you to try to blow-dry your hair while your husbands sets up the tent, so the point is moot.