Filling the tunnel bags
In order to hold the tunnel in place, you will need to fill the bags with something heavy. Most dog owners decide for sand. You can easily fill the sand into large gallon Ziplock bags and put them into the tunnel bags.
Some owners also choose water. If you want to fill your bags with water, you will need either a bladder of some sort, or several Ziplock bags. If you live in climates where the temperature drops below zero, filling them with water is not advised. It would expand if frozen and could damage your tunnel bags.
You need to make sure to fill your tunnel bags enough. They should be rather heavy. If you make them too light, they will not be able to weigh down the tunnel enough.
As a general rule: If the tunnel moves as your dog is running through it, you need to make the bags heavier. The bags above can hold as much as 25 lbs each – making them this heavy should hold the tunnel in place even for a lightning-fast dog.
Moving the tunnel holders
Once you fill the bags, they will not be as easy to move anymore. Many owners choose to rarely move their tunnels and let them stay in one spot to work around this.
Another option is to use a small wagon to transport the tunnel holders from one end of your agility practice area to another.