Poly bags are more costly than vinyl, but offer some significant benefits in use and durability. Poly will remain flexible in almost any temperature where vinyl tends to be a little stiff in cooler temperatures. For large curved work or pieces with a tight radius where confirmation is critical poly is the answer. Production quality rate Electrically welded, clamp-less, air tight vacuum Hose connection 400 lb tear strength resistance C" bar clamping closure system 6x to 8x elongation or "stretch-ability" 235 degrees F temperature resistance Shipping / Billing Information This product ships direct from the manufacturer: Your order will ship in approximately 5 business days. This product is considered special order. Your account will be charged when you place your order. Express or overnight shipping is not available for this product. Ships by Ground to the 48 contiguous states. Cannot ship to Alaska, Hawaii, PO Boxes, APOs, US Territories, Canada or other foreign countries. Return Information If you have a return issue, contact Woodcraft Supply customer service @ 1-800-535-4482 for return details. After 30 days, you will be charged a 25% restock fee. Customer pays return freight. When returning product, please include the invoice number or customer number and refer to the back of the invoice for shipping instructions. If purchased at a Woodcraft Store, please return the item directly to the store where your purchase was made. Warranty Information One year replacement for defective product. Please contact Vac-U-Clamp with warranty issues @ 888-342-8262.