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What do you fill your BUM bags with?

Different fill types for different bags and applications... like others have said buckwheat hulls, Air soft BB’s or rice. I even have a large bag with synthetic pillow stuffing(pic.) it’s perfect for that application. Just don’t let the rice get wet!!!
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Granulated Cork - Recycled (cheaper than new and just as clean)

For sale here: http://www.corkstore.com/Products/Granulated-Cork_2

I have tried lots of different fillers and while the cork is heavier than most other fills, it retains its great support without crushing. It makes a big difference when seated. Try one out the next time someone has one at a match. 

Gary
Venice, FL
 
Unless you've already purchased one, you might look at the meditation cushions (yoga) on Amazon. They come in a bunch of sizes and shapes and pre-filled with buckwheat hulls. That's where I got my bag for Open class about two years ago and it's been great. Mine came much too full but had a zipper where I could remove some until it got just right. After removal, the buckwheat feels like it kinda locks together and holds it's shape.

I was helping a Hunter class shooter that is considering switching over to Open. His bag is full of some kinda lightweight small chunks, seems like maybe closed cell foam. Anyway, the filling in that bag wouldn't build up and hold it's shape behind my rear end like the buckwheat does. I kept feeling like it was gonna kick me out the back and dump me over backwards, much prefer my buckwheat. 
 
We've used it all, pretty much. The lightest was rolled corkbits that lasted about 17 years in my wife's bag. Unfortunately I didn't buy any for mine at the time and haven't seen it since. I had corncob media in mine for a while but it weighed a LOT. After seeing Franklink's bag, I bought a couple and also made a couple of bigger ones and bought the buckwheat hull media from a place in Maine fairly cheaply. Buy more than you think you will need.... it takes a lot to fill the normal bum bags. Feels very cushy and has been holding up well without being real heavy. It's our favorite for sure.

The bean bag fill is good if you can find the small ball shaped fill... very light and holds up somewhat well, but the most common stuff breaks down quickly so you'll be filling every few uses.

Of course, it all works, so it's up to the individual how extravagant they want to be.

Bob
 
How many kilograms of cork will I need to buy to fill a good size bum bag? 

Mike

I bought 8 lbs whatever that is in kilos I used about 1/2 of it in a normal size bum bag I bought from RAW. 

I don’t see the bag on their website any longer. I would probably order 6 lbs if I were to do it again. 

Hope this helps

Gary