I standardized on Sortimo t-boxx for our workshops:
https://www.mysortimo.us/en_US/Storage-Bins-%26-Boxes/T-BOXX...
... and although the insert colors changed, the architecture and sizing has been constant for more than 15 years ...
https://www.mysortimo.us/en_US/Storage-Bins-%26-Boxes/T-BOXX...
... and although the insert colors changed, the architecture and sizing has been constant for more than 15 years ...
Meanwhile, among others, I've placed alerts for their L-Boxx Mini, so I buy a couple of them each time they go €8 or less. (Less than 8 is unusual, but around 8 is possible)