Mike Forbes’s “Ulterior Survival Bag” is more than your average carryall. Designed for Detroit’s homeless population, the bag transforms into a pair of boots that protects against frostbite and other foot-related ailments in winter. Forbes is a graduate of the College for Creative Studies, where he took a class in design activism. (Stephen Schock, the professor, had a single instruction: design to fill a need.) Like his classmate Veronika Scott, who developed a sleeping bag that converts into a coat, Forbes chose to focus on the city’s 18,000 chronically destitute. “It is meant to provide the homeless with a better option than garbage bags, which they usually use to carry their stuff and cover their feet,” he told the New York Times.