Herschel Retreat Backpack Navy Classic 19.5L The Herschel Retreat backpack is a medium-sized, unisex bag with a 19.5L capacity. It features a blue polyester material and polyester lining, making it durable and easy to clean, padded backstraps, padded 15" laptop sleeve, easy drawstring closure and magnet fastened straps. Height: 17". The backpack has multiple compartments and pockets. It also has adjustable straps and a comfortable handle for easy carrying. Ideal for everyday use, whether for work, school, or travel. Very good used condition.