For your summit-in-a-day hikes, pack extra layers, water, and food into The North Face Terra 30 Backpack and hit the trail. Stuff a compact sleeping bag in the bottom in case an overnight becomes necessary. Air flows between the pack and your back thanks to an open-air mesh panel across the back of the Terra 30 Pack. As the day heats up, peel off a layer and stash it in the front stretch pocket. Grab your water bottles out of the Terra 30s side pockets to stay hydrated, and stash your trekking poles in the pole-loops when the trail flattens out.