Workout bag for kids

[Superhero 9023]

My daughter has been taking Tae Kwon Do lessons for a years now, and my son started last year. Unfortunately without a workout bag to practice their punches and kicks, they've defaulted to literally kicking my ass.

I promised to get them a workout bag, but don't really want to hang a heavy bag in the middle of the garage (still holding out for a mid-life crisis sports car), thus I'm thinking of getting a wall mounted or floor-standing bag. A bag stand wouldn't work since they'll be kicking as well.  

Do any of you have kids who take martial arts? What are they using for practice? Any recommendations on a workout bag?

 

(For the record, they're both about 45 lbs now and I don't want anything too heavy, but not too light that they'll grow out of it).

Edited February 23, 2021 by Superhero