yeah. through bolt it, its not hard or expensive. you will need a hammer drill and bit. plus the nuts & bolts & large washers.
most anything else will fail.
most anything else will fail.
what other wall ? brick on the outside ?outside of the other wall
I think a toggle bolt is the best solution in this case, they sell some very nice quality ones, and with 3 of them you could surely hang off of this bag without worry.
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Very easy to install aswell assuming you can have a proper masonry bit, no special tools required