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high quality stuff-sacks
It's obtaining the necessary size you want to worry about. They don't need to be specialist high quality ones.
On a smaller scale I've got two years worth of backpacking and trekking out of standard nylon ones. That's hard use, being pulled, hung, stuffed, overfilled, etc. Yours are going to be stored in a van and moved from their home to the bed and back again. Maybe get ripstop fabric just in case.
I popped over to Decathlon yesterday - they did not have that sleeping bag. I think I'll give it a whirl with the current spare bedding from the guest bedroom for my first outing.
What would be useful, therefore, would be high quality stuff-sacks to tidy that away, is there a go-to brand for these, or are they all much of a muchness?