Gregory's earth-friendly and hiker-focused construction makes the Miko 20L Daypack one of our favorites for days on the trail. The pack's 20-liter capacity offers plenty of room for extra layers and calorie-dense snacks while we stash our reservoir in a dedicated pocket. But what makes this backpack a hiking hero is the BioSync suspension tech. The channeled back panel, perforated shoulder straps, and flexible hip belt all match our body movements to cut back on hot spots and increase our mileage.