🧿100% Nylon 🧿Zipper closure 🧿HOW TO MAKE THE COMPRESSION HAPPEN? - There Is a Extra Zipper Outside Of Our Compression Packing Cubes Which Can Be Zipped Up To Flatten The Cubes And Save The Space As Far As Possible. It Just Works Like a Vacuum Sealer. You Just Need To :1) Fold Your Clothes And Flatten Them 2)Pack Clothes In The Cubes And Zip The Normal Zipper. 3)Put A Finger On The Back Of The Zipper In The Space When Compressing The Packing Cubes In Case The Zipper Get Stuck In Fabric. 🧿PREMIUM UPGRADED NYLON FABRIC:Smooth&Soft Nylon Fabric Protects Your Clothes from Wrinkles and Stains.High Performance Feature Makes Sure this Packing Cubes can Bear High Density Wear and Tear during Traveling.Water-Repellent Feature Nicely Protect Your Clothes from Spill or Leaks.Easily Store Your Clothes and Protect Your Clothes from Stains and Wrinkles 🧿LIGHTWEIGHT&DURABLE:Super Light Nylon Fabric and Considerate Designed Construction Ensures Storing Your Clothes Neatly in Luggage without Adding Extra Weight.Premium Sturdy&Smooth Double Way Zipper with Extended Cord Ensure Fast&Easy Opening and Closing of the Packing Cubes. 🧿VERSATILE and MULTI-FUNCTIONAL :Different Sizes Packing Cubes for Different Packing Purposes.Separating Your Clothes,Such as Jackets,Sweaters,Underwears,Socks into Different Packing Cubes. 🧿ITEMS INCLUDED:This Set Of Packing Cubes Includes One Xl(17.5 Inx12.75x4in),One L Size(13.75" X 12.75" X 4"),One M Size(13.75x9.75x4), One S Size(11" X 6.75" X 4")