Happy Trails Aluminum Panniers are constructed with .080" TIG welded aluminum. The panniers are not assembled using glue or rivets and are top loading. A 3/4" lip around the opening makes the opening 11/2" smaller than the outside pannier measurements. The panniers can be easily locked with two padlocks (not included), and lids come with footman loops for strapping on additional gear. The panniers incorporate Happy Trails’ new Slot Hinge Design, a technology designed to meet the needs of today’s adventure touring. The Slot Hinge Lid has a pivot hinge on the outside of the pannier that, when running the panniers with a top box, some riders convert to liftoff lids by removing one hinge screw on each hinge.