The supplier (Fenton Packaging) said they are great in a dry environment, but that any moisture that got into the outside box soon caused the structure of the box to degrade.As our IBCs drip with condensation at certain times of year I decided to stick with them
I did also consider just putting a 1000l bag inside an IBC to emliminate the need for washing and also help keep air away from the cider. But again I didn't follow this up as at the time the bags were as expensive as an IBC and it would take a bit of though as to how the bag/tap would be accessed
Hope this helps somewhat.
If you do go ahead and run a trial I would be interested in hearing how it works out.
Nick
Circle Cider