Why we made this Two legs are better than four wheels! We designed this lightweight backpack with 360° reflective detailing for our run commute. We added quick-access zipper pockets for our phone and keys, molded the back for comfort and included a hidden front bungee system so we can easily grab our stuff on the go. Key features durable and water-resistant polyester is great in any weather 360° reflective detailing helps keep you visible in low light Mesh shoulder straps help keep you cool quick-access zipper pocket for your essentials ergonomically molded back panel for your comfort Luxtreme fabric pockets are perfect for gels and other types of fuel (gummy bears) adjustable waist and sternum straps for a secure fit inner water bladder pocket with low-profile elastic drinking tube straps padded pocket for your tablet 11.5L capacity is tested to hold 50lbs (22kg) imported Fit + function designed for: run, to-and-from fabric(s): polyester, Luxtreme , Mesh dimensions: 17" x 10" x 4" (43cm x 25cm x 10cm) p.s.: this bag weighs 1.23lbs (0.56kg)