Vinyl
RF welded seams
3-roll top closure
SM- 9.5L Dimensions: 13.25in H x 7.5in DIA, Capacity: 585ci/9.5L
MD- 20L Dimensions: 18in H x 9.5in DIA, Capacity: 1275ci/20L
LG- 40L Dimensions: 25in H x 11.5in DIA, Capacity: 2500ci/40L
XL- 57L Dimensions: 28in H x 12.5in DIA, Capacity: 3500ci/57L