body: 4 oz.yd² / 233 gsm, 100% polyester with water resistant finish; trim: 100% polyester oxford at top and back panels; Black/Carbon has reflective print; UTK Hydropel™ helps to keep contents dry in wet conditions; Tote design converts into backpack with stowable straps; Zippered main compartment with reflective toggle; Laptop compartment fits most 17" laptops; Inside zippered security pocket; Large front and back pockets with hook and loop closure; Mesh water bottle pocket on left side; Wide