The Patagonia Critical Mass Laptop Courier/Messenger Bag in red is a large, durable bag made of nylon with a canvas lining. It features a zip, hook & loop, and buckle closure, along with inner pockets for organization. The bag has a 5" x 12" x 18" size, making it perfect for carrying laptops and other essential items. The messenger style design includes an adjustable nylon strap for comfort and convenience, as well as reflective details for added safety. This unisex adults' bag from the trusted brand Patagonia is both functional and stylish for everyday use.