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Flexible Ballast To Dial in the Perfect Wave. Buy Pre-Filled to 45 lbs, or Buy Empty to Fill Yourself.
Supplement your boat's ballast with Roc Sac ballast bags to boost your wave height and fine tune the shape. Fits easily in storage compartments, lockers, and under seats. Easily move bags to locate weight where it's needed most. No more shuffling friends and family around the boat.
Hit the easy button and buy pre-filled or buy empty and fill with sand, rocks, steel shot, or other fill material of your choice. Leave your filled Roc Sac ballast bags in your boat for convenience, or empty at the lake. Towing long distance and don't want to haul extra weight? No problem, bring empty Roc Sacs and fill with sand or rocks at the lake.
Easy & Secure Roll-top Closure
The easy-close roll top seals securely with hook & loop strips, keeping the contents contained and your boat clean.
Flexible Fill Options
Fill with your choice of material. Weight will vary from about 40 lbs (sand, gravel) to much heavier based on the fill material. The pre-filled option comes loaded with a dense sand/gravel mix.
Wide, Easy-fill Opening
Filling is a cinch with Roc Sac's wide-mouth opening. Fill in seconds by hand or with a shovel. Emptying the contents is quick and easy too.
The Perfect Tent Anchor
Easy to fill, and easy to empty and clean when finished, Roc Sacs make the perfect anchor for pop ups and tents. The tough handle doubles as a tie-off for a rope or clip.
Great for Jetskis
Roc Sacs are small and light when empty, making them easy to store in a jetski compartment when not in use. Just fill them with rocks or sand when you're ready to anchor your jetski!
Beach Bow Anchor
Just fill with sand or rocks, and tie off your boat's bow or stern to your Roc Sac. You can also bury your Roc Sac a bit or tie off to several Roc Sacs if it's particularly windy out.
Premium Waterproof Material
Made with ultra-tough 22oz PVC coated polyester fabric. Fabric is waterproof and UV resistant. Won’t stay wet and gross like other uncoated fabric ballast bags. Heat welded seams are strong and water tight. Built to last.
Compact and Low Profile
Easily stows away in lockers, under seat cushions, or anywhere you've got a little empty space. A filled Roc Sac is about 15" x 12" x 5.5". Designed to keep its low-profile shape, even after filling.
Tough Carry Handle
Nylon webbing handle is durable, comfortable, strong, and optimally placed for easy maneuvering. The handle also works great as a tie-off point to attach a rope or a clip to allow your Roc Sac to hold stuff in place.
Fill
Remove Air
Roll
Seal
Nicholas w.
2025-08-27 18:00:38
Exactly described, I added some lead wheel weights to mine with the sand making them weigh 85 ibs. They still hold up amazing to the extra stress of nearly double the weight. They don't leak any sand either. would recommend to anyone. Only improvement would be some sort of grip on the bottom to prevent sliding.
skarlson65
2025-02-17 15:48:24
I was able to easily add 450 lbs of ballast with these bags. Very well constructed and the handles are great. Easy to move and transport and no leaks!!
Calep W. Howard
2025-01-02 10:19:46
The opening of the bag is opposite the handle. When I filled the bags with sand and lifted them by the handle the hook & loop closure at the top wasn't strong enough and opened up spilling the sand out of the bag. These are JUNK and should be avoided at all costs. I took too long to use them and missed the 30 day return window so these will be going to the landfill.
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