These boxes might possibly be suitable - they are not as strongly built like Dennis's dovetailed boxes, but you could easily add in some strength at the corners underneath some high density foam and add some handles.
But they would need some reinforcing in my opinion if you have a few kg of glass and adapters in them.
They are only made from 3ply timber (8mm) - but they are reasonably cheap at $31.35 each.
Size 340mm x 250mm x 88mm
http://www.entosupplies.com.au/?path=1_1_17_150