had a close look at one today merlin.. as they did look pretty good at a glance they have an aluminium frame only as far as can tell.. the walls even appear to look like an aluminium case .. but I think its bonded cardboard seems very flimsy when you give it a squeeze.. maybe they would be ok ? I 'd be a bit leary on getting a bit of moisture on them for a month or two and carting the babies inside one .
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