For backcountry hunters, a new generation of backpacks embraces the “go in light, come out heavy” ethos pioneered by Idaho pack maker Glen Eberle. These multi-day packs are designed to convert from compact rucksacks to full-size freighters capable of hauling out meat, rack and cape, plus your gear and gun or bow, in a single trip. We tested these packs by toting entire field-dressed whitetails during a late-season Montana doe hunt.