Tunnel Bag Water Bladder Inserts with Screw Caps

(3 reviews) Write a Review

Bulk discount rates

Below are the available bulk discount rates for each individual item when you purchase a certain amount

Buy 16 - 30 and get 10% off
  • Tunnel Bag Water Bladder Inserts with Screw Caps
  • Tunnel Bag Water Bladder Inserts with Screw Caps
  • Tunnel Bag Water Bladder Inserts with Screw Caps
  • Tunnel Bag Water Bladder Inserts with Screw Caps


Water bladder bag that fits inside Tunnel Bags has a screw cap - the perfect solution for saving weight, restoring leaky bags or easy winterizing.

• Simplify your spring/fall chores: just fill with water in the spring and empty in the fall for winter storage. 

• Extend the life of your existing tunnel bags — use as a replacement leak-proof liner for older tunnel bags that are ripped and leaking sand. 

• Save fuel and weight and transport empty bags to a trial and fill bags onsite.

5.28 gallon (20 litre) food-grade bladders fit our Thunder Competition and McWedge tunnel bags and most all tunnel bags. Lay the bladder lengthwise in the tunnel bag so the the long end (26") runs parallel to the zipper. Then unscrew the top and fill with water to the desired weight. The bladder expands to fill the tunnel bag. See our filling instructions video below. Thunder Competition tunnel bags weight 28 lb (12.7kg) when filled with water; McWedge tunnel bags weigh 32lb (14.5 kg) or as heavy as one can carry when filled with sand or pea gravel. Completely collapsible, dump the water when storing or for transport. Measures 25” x 18.5” (645mm x 470mm) empty. For McWedge tunnel bags we recommend filling with a 1-1/4” (32mm) layer of pea gravel then lay a filled bladder on top. This spreads the weight over the entire bottom footprint of the bag and ensures the feet make contact with the turf. Tip: for winter use in northern regions, add 1 cup of rock salt. Note: Bladders are ultra tough, heavy duty, durable food storage bags and are warrantied against leaking upon receipt only. If a heavy weight is applied when filled (i.e. human foot) the seams could potentially split and the bladders leak. 

View AllClose

3 Reviews

  • 5
    These are game changers!

    Posted by Ellen on 2018 Oct 4th

    Why didn't someone think of this before? Easy to use, easy to carry bags with water, and do a great job of holding the tunnel in place. Much more forgiving should the dogs hit them, versus sand. Absolutely love them!

  • 5
    Saves Weight and Fuel

    Posted by Joanne P., Texas on 2017 Apr 4th

    We fill them at the training hall and bring them to the site. We dump them at the site when the trial is over. No one complains about us watering the lawn. The positive in using them for us is that sandbags take up a lot of floor space and the empty tunnel bags are stored in a container on a shelf.

  • 5
    Love these bladders!

    Posted by Steve A., New Mexico on 2017 Apr 4th

    We use them at our trials and they are wonderful. I like how the water gives if a dog should happen to hit a bag.

View AllClose