Silica gel container with bigger and more holes

I took the really cool design from kpawel and improved it a bit for my purpose.

The main idea was that the square holes have a 27% wider opening surface without letting the round particles fall through any easier (the holes are still 1.5mm wide). Also a sphere and a square hole can never form a seal unlike a sphere and a circular hole. Furthermore I put more holes of them in the same area.

All three measures should improve circulation of air and boost effectiveness.
As a side effect it pr