Is there a difference between shooting bags

All kinds of bags out there do everything from rest your elbow to rest this and rest that they make ones that are shaped like rabbit is leather all kinds of crazy stuff I started off with the Caldwell Bad Santa came with two bags for like 12 bucks and I like them you can put sand in them and put anything in them I got these recycled crushed like black pellets that I put in them I don't shoot professionally so you know I can put whatever I want in them a tall LED shot people put all kinds of thing in them but I don't want something it's too heavy I want something that's not going to blow away but I suggest you to start off with the Caldwell ones comes with a two pack and go from there like I said they're like 10-15 bucks if I can find the link I'll send it to you but if you type in Caldwell bags you'll see them their green and black
 
Unfilled bags are a lot cheaper to buy and ship . I have done a lot of research on what to put in bags for fill. You don’t want anything that holds moisture because of mold issues. Airsoft B.B.s are one of the best but expensive on large bags. The best I have found that is cheap is horse bedding. It is pelletized corn cobs. Found at tractor supply for $10.00 for 50# bag. Corn cob is not supposed to hold moisture and is of a medium weight. It worked great on my bags. I have two large one piece bags that I put the cob in. Smaller bags lead shot or washed pea gravel would probably be better. You just have to experiment with different styles of bags and see what works best for you and your environment where you are shooting.