Built for day hikes or urban commutes, the Trail Zip 18L is designed for traveling light. With 18 liters accessible by zippered access, the Trail Zip 18L also features dedicated Z-pole sleeves to stash trekking poles, and our signature BDFlash pocket specifically designed for headlamp storage, keeping you safe and visible . An internal stash pocket stores your wallet and keys, while four connection loops along the back allow you to secure the Trail Zip18L to another larger pack so you can have a quick-detachable summit pack while out on bigger adventures.