Guiding a group of lodge guests on a hike involves a little preparation. It's good to have enough room in your pack for extra water and a first aid kit, plus plant and animal identification books are always a hit. The Gregory Inertia 30 Backpack gives you plenty of room, and it helps keep your energy rolling when you're in the lead--a padded hipbelt and shoulder harness make long distances feel short, and a mesh-lined back panel gives you ventilated comfort when you stop to deliver a natural history lesson. Plenty of features enhance your performance, from the included reservoir that makes on-trail hydration nearly hands-free, to the trekking pole attachment that stores an extra pole in case a guest has need of it. A magnetic closure on the sternum lets you link your bladder's bite valve to it, eliminating the annoying dangle where it flops all over the place while you're hiking, and if a guest asks a question about an unfamiliar finch, the back stretch pocket makes it easy to whip out your bird book and find the answer.