Just Porter Streeter Bike Backpack Gray | 15" Laptop | 19L - 23L ROLLTOP BAG with fast access via magnetic buckles. TSA airplane carry on compliant DURABLE EXTERIOR keeps your gear safe. Holds 17 inch Macbook laptops or smaller LIFETIME GUARANTEE against material and manufacturing defects, which means you're covered beyond Amazon DIMENSIONS: 18" x 12.5" x 6" Height expands to 21 / Medium 19 Liters expands to 23 BONUS: For Each Bag Bought, Just Porter Gives a Bag Filled with School Supplies to a Child in Need