Reddit reviews Trans American MR14/MR15 Inner Tube with TR13 Valve Stem
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Heavy duty inner tube for use in farm, industrial and passenger/light truck tires.TR13 straight valve stem.See product description for fitment information.For use in bias or radial tires.
Take some heavy duty contractor bags, fill them with sand of desired weight, tape them tight, and place them in the backpack.
For added features, you can make a Bulgarian Bag using a truck inner tube. You can use this bag for all of those bodyweight exercises by balancing or strapping it on your legs or shoulders like so.