Next, you take that bundle and flip it inside the bag
Once you flip it, make sure you pull the ends of the bag until the initial bundle is tightly inside the bag. Next, you begin to wrap that bundle onto itself. Make sure that each fold is tightly packed.
Once done, fold the sides tightly and secure the resulting bundle with duct tape. You can see in the scale that it’s about 15lbs.
Then add more duct tape accross the bundles. Use your judgment in how much you want to use (for me, more==better)
Then, I put the bundles in sea bags I bought in amazon for $15. Using two bags makes it a bitch to grip. So use one or two depending on what you want to train.
And that’s the bag on the right size (next to some other crap I made) and three 15-pounder bundles in front of it. So far I can load that sandbag up to 150lbs at 15lbs increments. I want to make two 10-lbs bundles and more 15lbs ones to get up to 200lbs.