Based on the ever popular Hadley Original, the Hadley Pro is a mirror with added features. A carrying handle is integrated with a stiffener into the top flap. The weight of your gear is not carried through canvas holes that could wear out, rather they are attached to a fiberglass stiffener and weight supported through that. A waterproof zippered back pocket is very useful for tickets, magazines, manuals or any other flat document. The facility to add extra capacity with the AVEA pouches rounds off the bag nicely. It has a fully removable insert and features adjustable Quick Release strap into brass buckles, bellowed front pockets with press-stud fastenings and a double darted main flap which covers the mouth of the bag when closed protecting it from rain and weather elements. The fully adjustable shoulder sling is sewn under a leather side patch, which provides the facility to attach the AVEA side pockets. The AVEA03 is the nicest looking fit as they are slimmer and match the side profile of the Hadley Pro. However, the AVEA05s will also fit if you need extra room and are less concerned with aesthetics.