I have been using the standard green plastic pots for over 40 years. Now my collection is growing mostly in 4 or 5 inch pots. Those two sizes make up about 2/3 of my containers.
I use 3", 3 1/2" and 6" pots about a third of the time. So to get to the point, I needed to reorder plastic pots. Check these out as I had never noticed them before.
These first two are 13cm. or 4" pots.
The next two images are the 15cm. or 5" size. Notice the bottom drainage area and the side drainage slots arranged vertically.
They are made from a much heavier plastic then the typical green plastic pot. They are much thicker then those plastic sleeves that I see.
Yes, they cost more but are sturdy. I can't wait to see how the plants grow in them.