Bags are widely used as packing bags, shopping bags, shipping bags,Wedding bags, Normally it is made by PE(LDPE), Non-woven fabric, Canvas, Twill, Cotton fabric.
Shipping bag is widely used for company who has online shop. Comparing to the normal express' shipping bag(DHL, UPS, Fed-ex), They can have your company' logo and also other information you'd like to add on.
Zipper poly bag is one kind of sealing Bag which is easy to use. To be simple, zipper poly bag is easy to open and easy to close. Normally, it is made by LDPE and TPU.
Self-sealing poly bag is another kind of sealing bag, it can be sealed by pressue two side together but it need to be carefully treated, otherwise, it will not be sealed perfectly.