PVC wraps are less permeable than low density polyethylene (LDPE), and will keep keep anything wrapped in it more air tight but have been found to release plactisizers (DEHA, DBP, and DEHP) into foods, in particular fatty foods, and the enviroment. As most organic based soap has a high fat content from super fatting I would say the odds are soap will probabaly be at high risk. LDPE, is less dence so not as air tight, nor does it strech or cling as well as placticised PVC, but it is considered safer and more enviromentaly safe. Glad Cling Wrap, Handi-Wrap, and Saran Premium Wrap are LDPE-based. I am not familiar with Sam’s Club plastic wrap, but as LDPE is cheaper to manufacture it is probabaly LDPE.