I remember seeing one for a metal framed 'tent' but sadly I cant remember details for hat one
However I do have a 'vac-bag' - yep OK its just a big poly bag and a sack of dry-sorb or sillica gel - but I thought it was a great kit....heres the link...
https://secure.webhoster.co.uk/www.a...vacbag/vbshop/ Happy shopping