u003cbr/u003eThe bag needs to conform to your rest. However, it also has to have enough heaviness. Sand is the most common material used for filling a bag. If you need more weight, you can try using gravel, which also provides a solid bag shape.u003cbr/u003eu003cbr/u003eu003cimg alt=u0022What do I need to use to fill my rest bagu0022 src=u0022https://proreviewbuzz.com/wp-content/uploads/2020/05/What-do-I-need-to-use-to-fill-my-rest-bag-.jpgu0022/u003e