Best container to move prized records between homes? Thanks!

Please what is the best main container for moving prized records between homes, e.g. One Steps, UHQR, Mosaics, MFSL, Nautilus SuperCuts, .

I've a few small 'DJ flight cases'  but is the answer to buy more or is there a cheaper, proven option(s) out there?  Thank you in advance!  :-)