VERSATILE & AFFORDABLE: Skip the trip to the hardware store when you buy these empty sand bags now. Weighted bags of sand are a cost effective solution for countless home and garden projects. Plus use these earth bags for building anything you can imagine. Made to meet military specification MIL B-52472 C. UV PROTECTION: This sand bag is rated for 1,600 hours in the sun and will begin to photodegrade after 66 days of direct sun exposure. EMERGENCY FLOOD CONTROL: Woolsacks sand bags for flood control make an excellent water barrier to protect your home, family or business. Keep these flood bags on hand to be prepared for heavy rain or hurricanes. EASY TO FILL & CLOSE: Each sandbag has an 18" wide opening to allow for easy filling and it comes with a zip tie for quick closure on-the-go. These heavy duty construction sand bags are great for concrete work or earthbag construction. HEAVY DUTY SAND BAGS: Woolsacks polypropylene sandbags are both tough and durable. These empty sandbags hold 50 lbs. of sand or gravel without ripping and resist punctures and tears.