I've got a new front-rest build under way (since someone burnt my stand last winter and I lost the one I had) and I'm looking for suggestions on the filler material.

This one is leather, 3" tall, 2" wide and 7" long. It's also probably going to be carried in and out so weight is a consideration; hence, not automatically filling it with sand.

I'm looking at using dried rice or beans but didn't know if something out there was a better or more durable option.

Thanks in advance.