Kettlebell / Bag of Rice / Bulgarian bag variant (self made and cheap)
Wanting to get some new training equipment which would ideally be sports-specific (grappling), i stumbled above this:
I gamed around with the idea and finished buying a sea-sack ( like the vaude orca, but i'm sure there are cheaper variants out there ) and 10 kilos of cheap rice.
Buy 10-22 kilos of Rice and fill it in the bag, close it and remark on the Kettle-bell like form, when rolling down wide.
Now depending on the density of your material you can have a KettleBell-ish or with the Gi-option described in the Video, Bulgarian-Bag-ish training tool which is also usable as a bucket of rice.
And you can upgrade the weight when you start getting stronger :)
PS: please excuse typos, etc. since english is not my native language