Lightweight And Strongly Made Of High-Density Full-Polyester Fine-Bead Polyester Fabric. The Woven Drawstring Is Strong And Durable, And It Is Not Easy To Fall Off. You Can Take The Internal Items Well, You Don€t Need To Worry About Losing Items, It Is Very Convenient, You Can Also Adjust The Length Of The Shoulder Strap By Yourself, Just Tie A Knot Under The Rope.Applicable Scenarios: It Can Be A Fitness Backpack Or Schoolbag; It Is Very Suitable For Sports, Fitness, Yoga, Travel, Etc.; It Is Light And Portable, And Can Be Folded At Any Time Without Occupying A Position。It'S Very Convenient To Open And Close. Pull Both Ends Of The Rope To Open And Tighten The Pocket.