The Marmot Kompressor Plus Backpack is an ultralight pack for speedy day hikes. This 20 liter wonder has a removable closed cell foam backpanel, so you can choose your comfort level when taking to the trail. The interior has a clip to hang a water reservoir from, but you can also jam a water bottle either of the two front stretch pockets. Compress it down when it's not stuffed with gear, it'll fit right into the lid for travel purposes.
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