Tired of buying a new school pack every year Duluth packs are the toughest available and are Guaranteed for Life. Popular as a book bag but durable enough for any wilderness adventure, the Standard Daypack collection is designed to provide years of use in a style that only gets better with age. Our Standard, Deluxe, Serengeti and Laptop designs are available in a variety of sizes, colors, and materials to match whatever your lifestyle may be. The zippers we use in our bags, designed and built by YKK, are the absolute best and are designed to excel in outdoor environments where mud, sand, and rain can play havoc on moving parts. The ample front pocket in the medium and large sizes feature slip pockets for penspencils, a calculator, cell phone, or iPod. We recommend the small for elementary kids, medium for middle school, and large for high school and college students.