QUICKEST WAY TO ADD WEIGHT - 50 lbs. When Filled With Water EXTREME DURABILITY -Super Heavy-Duty Valmex PVC - Same as River Rafts LEAK-PROOF DESIGN - Ultrasonic Double Welded Seams HEAVY DUTY CONSTRUCTION - Watertight Zipper The Strongest Of Its Size EASY TO USE - Double Handle Design To Easily Fill By Dipping In Lake/River/Ocean etc. Simply to use and easy to store water ballast bag. Not everyone wants to wire pumps into their boat or Spend 20 min. filling and 20 min. emptying bags every time they surf. ...our solution, the Laguna Dip Ballast Bag. Just lean over the side, dip the bag, hold on tight, pull it up, and zip, BAM 50lbs. of ballast. Designed by our team and engineering experts, the Dip Ballast Bag is made of Extra Durable PVC with Ultrasonic Over Welded Seams, these are built to last. The heavy duty handles are bonded on beyond the requirements of white water rafts! Use one or two to offset the driver, or fill your whole boat with these Laguna bags! Dimensions: When Full - 22 x 13 x 7 in. When Empty - 22 x 12 x 1 in. (Can be folded or rolled) **Bag can be filled with sand BUT ONLY HALF FULL which is appx. 50 lbs. exceeding 55 lbs in bag will void warranty**