I suppose you could always make one out of wood.
Would be a little heavier. But hey, as light as the saws are, it could still be carried in one hand.
There are all sorts of plastic storage boxes that are plenty big, and less than $20. Again, because of the light weight, the box doesn't have to be heavy duty.
https://www.homedepot.com/p/HDX-64Qt...9Y06/310918149
https://www.target.com/p/hefty-18gal...E&gclsrc=aw.ds
https://www.academy.com/shop/pdp/pla...00005323928058
How about a 10 gallon trash can, with lid ?
https://www.homedepot.com/p/Rubberma...E&gclsrc=aw.ds