How Big is a 20 Liter Backpack? Visual 20 Liter Backpack Size Guide | Backpackies
Dayliner Box Bag (20 L) - Handlebar & Trunk Bag – Two Wheel Gear
Amazon.com: Two Wheel Gear - 4 in 1 Dayliner Box Bag (20 Liter) - Water Resistant Rolltop for Bike Handlebars, Rack Trunk or Basket with Shoulder Strap (Graphite Grey) : Sports & Outdoors