The Bag Trainer is a Delrin block cut to just the shape and size of a 3” benchrest rifle forend. If you clamp the Bag Trainer in your front rest bag when you are not shooting, the rest bag will retain the perfect shape you worked hard to achieve when the bag was new. Simple idea, but it works very well.
Update 07/13/2021: Bag Trainers are in stock. We are now making them in house.