As rugged and thoughtfully engineered as the best daypacks—think padded laptop compartment, a pair of water bottle holders, and an ample supply of zippered storage— the G-Train K9 Pack adds a pet carrier compartment with a zip-open mesh top that rolls neatly out of the way. You think your dog is cute now? Wait until you see his little face sticking out of the G-Train, watching the scenery roll by.