Pair of Water Bladders: 20L each

I designed these water bladders so they can be used inside the Block Sandbags (not suitable for the Donut Sandbags), matching the capacity of the Sandbag and providing a weight of around 35 pounds per bag when used this way. Although not as good as using sand, it simplifies the process filling up of the sandbags for situations where sand may not be readily available. These will work well with the Block Sandbags when used for either the OctaBase or a DIY base made from layered MDF boards. They are extremely strong.

Important Note: the Water Bladders are not be suitable for use with the Platform Paddles. The Platform Paddles require a firm body of weight pressing down on each paddle, such as sand or even better - wet sand. Although you could still use these Water Bladders by filling them with sand through a funnel, then adding water to achieve greater density, it's easier to simply use a large garbage instead. You could also double-bag the garbage bags for greater protection from a possible puncture in one. 

How to Use

Insert the Water Bladder into the opening of the Block Sandbag and inflate with air first so that it pushes out and fills the internal space of the sandbag. Then fill the water bag with water from a tap, hose or watering can. As you fill it, hold the opening as high as possible and fill until almost full. Screw on the cap tightly and check to see if it is sufficiently full. If any water is spilled onto the sandbag, allow the sandbag to stand in the open under the sun to dry out.

Note: in some situations the two Block Sandbags with these Water Bladders filled with just water may not be sufficient. In such cases you could fill the Water Bladders partly with sand using a funnel, and then the rest of the way with water. This will add extra wight. The more sand you use in conjunction with water, the heavier and more dense each bag will be.