I am wanting to make a drag bag to case my rifle in the field. I want to have a Pelican case to travel with but I can't afford that right now and would like something lighter for the storage long term. Have any of you made one in the past? What ideas could you give me to make it right. I plan on using it to transport my rifle as well as use it for a shooting pad in the field. What features do you like in a case and what do you think aren't worth it?