Pro X Series quick connect Fat Sacs has taken fat sacs to a higher level. The new Valmex material, similar to river rafting material, is so strong that punctures and abrasions are virtually a thing of the past. Seams are welded and seam-taped so strong that common failures experienced with other's sacs will not happen. No longer search for an inner valve bladder, just connect, pump, and go. Once you use these sacs you will agree that all other sacs are obsolete. Measures 12" x 26" x 62". Weight contribution: 580+. Choose from black, blue, grey and yellow. Items are dropped shipped from vendor, please allow 2 weeks for delivery.