A zipper storage bag, slider storage bag, zipper bag, zip lock bag, or zippie is an inexpensive flexible rectangular storage bag, usually transparent, made of polyethylene or similar plastic.There are several types of resealable features available for plastic bags. Zipper bags are sometimes used to describe bags with conventional zip fasteners, such as cloth bags for toiletries. Read more: http://www.bpbpak.com/Zipper-bag-pl536145.html