Doubling up on a bicycle isn’t something we’d recommend, but a number of products are there to make it a little easier and more importantly safer to take a friend along for the ride. The Companion Bike Seat is designed to provide a true second seat. It can attach to any bike that could support a rear rack, and is sturdy enough to support a rider up to 200 pounds.
Beneath the hinged seat is even a splash-proof and lockable storage box so you can take a person and something small on the ride.