Jumbo Jammer Handlebar Bag: 17LWe won the Best Large Handlebar Bag by Ultimate Gear List! The Jumbo Jammer is a high volume, rack less, and weatherproof handlebar bag. This massive bag is the largest in our Jammer line and is perfect for bike packing, road touring, and commuting. Load it up with the essentials and use the cargo straps (included) to strap even more on top! When fully expanded, the Jammer will reach up to 26L in volume and be rolled down to more than half of that.