I bought the set of three rectangular containers today for $4.95 at a
local shop. The internal dimensions are:
105 x 67 x 35mm 0.24 litre
140 x 89 x 45mm 0.5 litre
166 x 109 x 55mm 0.9 litre
The actual board size would be less than these since the corners are round.
It is probably not a good idea to leave etchant in them for a long time,
since the pressure on the seal and/or the etchant might damage the seal.
The stockist link at:
http://www.maxwellandwilliams.com/mw/maxwell-williams-storage-canisters-jars-snap-and-store-rectangular-container-ls3290.aspleads to some distributors and retailers outside Australia, but I
couldn't easily find where they could be ordered online for customers in
other countries.
- Robin