Ortlieb Back-Roller Classic 

Whether you’re heading to the office or hitting the trails, this pannier will keep your essentials safe and dry. It’s made from durable polyester fabric with a waterproof roll closure, and is perfectly sized for snacks, equipment, gym clothes, or anything else you may need on your journey. Mount and remove it from your Bluejay’s back rack with ease, then use its shoulder strap to carry it with you comfortably.