It Is Made Of Lightweight Polyester Beads And Is Strong. The Black Polyester Cloth Fixed On The Back Is Stain Resistant And Has The Fashion Sense Brought By Color Contrast. The Woven Strap Is Durable And Not Easy To Fall Off. Drawstring Design: It'S Very Convenient To Open And Close. It'S Easy To Take Internal Items Without Worrying About Losing Items. It'S Also Very Convenient To Adjust The Length Of The Shoulder Strap By Yourself. You Just Need To Knot Under The Rope. The Biggest Feature Of This Model Is Durable And Light, Small And Folded, And It Doesn'T Occupy A Place. It'S Convenient And Practical To Carry. It Can Also Be Printed On The Group Activities Ogo Design, Gifts To Friends And Relatives Are Very Good Gifts.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 Up At Any Time Without Occupying A Place.