As someone who has been a course builder for 16 years and a judge often without the assistance of a dedicated tunnel setter, I'd like to add to the tradeoffs.
Snugglers work ok, depending on the ground into which you put your stakes. Hard and/or clay based soils you will want to use long masonry screws and battery powered drills. If you don't have several drills and a means to charge them during the day, your course builders will be quitting you by midday. It is back breaking on your knees work. Building a tunnelers course with these on a warm day will likely cause a full blown mutiny. But for dogs, they move similarly to the rest of the tunnel. That can be good for safety but lead to dogs thinking they can blow through them sideways all the time.
Sand bags are handy and easy and hold but are heavy and difficult to haul. They also can be like hitting a brick wall for the dogs compared to the snuggers. They may hit them hard the first time, they won't the rest of the day, one way or the other.
Water bags are easier on the dogs, as easy to handle as sand bags and store and haul as easily as the snuggers. The only catch is the necessary water supply and a scale to ensure you get the right and consistent poundage. That's about 2.25 gallons per bag, 4.5 gallons per tunnel end.
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