I already offloaded most of mine from my move earlier in the year, but I'd highly recommend consistent sized boxes as much as possible. I also don't recommend boxes that are significantly over weight. You and/or your movers will appreciate it and it will speed things up significantly too.
IMO, knowing what I know now, paying $100-150 ish in boxes and quality tape really helps to speed up a move and unpacking after a move. It'll also potentially save you grief with a mover. Easy to stack and less likely for a weak box to be crushed and damaged your stuff.
I acquired ones similar to these that I felt were reasonably priced and the size was perfect for a bunch of things without being too heavy.
https://www.staples.ca/products/4155...bundle-pra0063
A buck a box for a 1 foot cube. Easy to move/stack and not overload to being too heavy for a variety of things. The consistent shape is also really easy to work with when stacking in a van etc. vs irregular shapes.
I still use some of these in my home for random storage.
Uhaul has some pretty good options too for a similar price and they have handle holes too.
https://www.uhaul.com/MovingSupplies...g-Box/?id=3245