These guys are core and environmentally sound. This Colorado-based company had been helping adventurers climb mountains and see the world since 1979. We carry the full Mountainsmith travel series. Our Mountainsmith packs are incredibly lightweight and are designed to both tour urban cities and summit remote peaks. And among the best features of our Mountainsmith backpacks is that they are eco-friendly and made from recycled materials. Mountainsmith pulls between 16 and 18 plastic bottles out of the jaws of the landfilled to make each of the packs we carry. That's alot of bottles. So check out our Mountainsmith packs, see the world and feel good about doing it. Oh, and try to cut down on bottle water!