Military kit bags, a good idea?

My son starts training on 8th July.
He'll be travelling from our home in France to HMS Raleigh.
Rather than a rigid large suitcase would it be sensible to buy a military kit bag to transport ALL the kit needed? My thoughts are that, once unpacked, the kit bag could be easily folded away.
Any ideas on the capacity? Yes, the list is extensive but it'll need to comply with the airlines and he'll need to be able to carry it on his back.
Any help would be gratefully received. Thanks in advance.

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