These bags are used as swimmimng pool cover weights for the winter. They make excellent floatation bags for your T Boat.
You can put metal grommets in them to fasten them to the boat. You fill them from the bottom with high density foam.
They come in lengths of 4 ft., 8 ft and 10 ft.
There is a corner one 1 foot by 1 foot.
Here is a link to show them.
http://wetheadmedia.com/water-tubes-bags-buyers-guide/They add very little weight to your boat and your boat will float!
The bags keep water out of the foam.
