Designed for those picking up groceries and carrying bulky items on their bike, the Ortlieb Trunk Bag RC replaces your traditional pannier or commuter pack by attaching to a rear-mounted rack. Ortleib's Rack-Lock system attaches to practicably any rear-mounted bike rack on the market, ranging from 2. 4 to 6. 3 inches across. Ortlieb claims it'll carry up to 22 pounds, so you can use the Trunk Bag RC on bike touring adventures and everyday rides to pick up your groceries. It's designed to be impervious to heavy downpours and road spray with its waterproof fabric and roll-top closure, meaning your precious items won't become ruined when a passing storm dumps rain with seemingly no notice. There's an external (non-waterproof) pocket for quickly grabbing and stashing essentials like your keys and wallet, plus an internal organizer pocket for safely storing smaller items. And because your daily commute and adventures often extend well past sunset, reflective accents and a tail light attachment ensure you're visible to passing whizzing by on the road.