Buy on Amazon : http://www.amazon.com/gp/product/B004ZASXXM?tag=lottalatte-20

Tenba 637-311 Discovery Medium Photo/Hydration Daypack (Black)

Discovery is the lightest weight collection of professional-level bags that Tenba has ever created
Built to our legendary Crafted Without Compromise standard
Discovery bags are the perfect carrying solution for photographers who want to walk bike hike or climb with their gear -activities which truly require the lightest bags available