The Aux Compartment is a compact and tough shoulder bag that also connects to the Errant Pack , Errant Pro , Errant Sling , and Rennen Pro . It's made to organize small essentials like pens, tech gear, and sunglasses while keeping them safe from the elements. With stormproof zippers and weather-resistant materials, it's perfect for daily use or travel. Specs Dimensions: 6W x 9H x 6D" Capacity: 3 L Weight: 0.2 lbs. / 0.1 kg Features Two compartments, five pockets, and pen slots keep everything organized. Comes with an ACC Shoulder Strap for easy everyday carry. Strong aluminum hardware connects it securely to other Boundary bags. Stretch-mesh pocket for quick-access items like keys or cables. Weatherproof YKK® StormGuard zippers protect your gear from rain and dust. Built from waterproof 840D Nylon and finished with Barricade™ DWR coating. Soft Nywool™ pocket keeps sunglasses safe from scratches. Main compartment fits small tablets like iPad Mini or Kindle. Made in Bluesign®-approved factories for sustainable production. Shipping + Returns Enjoy free 2-day express shipping on U.S. orders $100+ and fast international shipping on orders $400+. Learn more Shipping Delivery . 30-day return policy.