Self Fill Ballast Bag, 40 to 60+ Pound Capacity, for Wakesurfing and Wakeboarding

DIAL IN YOUR WAVE - Easily move ballast from side to side or back to front to fine tune your wave. No more shuffling friends and family around your boat. PREFILLED and LEAK PROOF - Comes loaded with a sand/gravel mix for a weight of 45 lbs per bag. Tall roll top with secure hook and loop closure seals contents inside the bag to keep your boat (or anywhere you use the bag) clean. FITS IN SMALL SPACES - Easily stows away in lockers, under seat cushions, or anywhere you've got a little empty space. Solid fill materials are more dense than water making ROC SAC great for tight spaces. A filled Roc Sac is about 15" x 12" x 5.5". PREMIUM DURABLE MATERIALS – Made with ultra-tough 22oz PVC coated polyester fabric (1000X1300D). Fabric is waterproof and UV resistant. Heat welded seams are strong and water tight. Built to last. VERSATILE APPLICATIONS – Great for boosting your wakesurfing wave and so much more. Anchor your jet ski, secure your tent, balance your small watercraft, or secure cantilever patio umbrellas, patio furniture, pool covers, trampolines, or almost anything you want to stay put.