adventure appalachian trail arc blast backpack backpacking baxter befree big agnes bmt book camping colorado trail connecticut cooking cuben fiber dehydrated meat family food for sale gear gsmnp guide hammock harper's ferry headlamp hiking hostel jmt john muir trail katahdin long trail mail drop maps marmot massachusetts new york nobo osprey parking pinhoti quilt safety sawyer section section hike section hiking shelter shelters shenandoah national park shuttle shuttles sleeping bag sobo 2018 springer springer mountain stove tarp tent thru-hike thru hike thruhiking titanium transportation ultralight water water availability water filter weight zpacks zpacks duplex