The Lady Magazine
Home Help by Hugh St Clair
"Or how about a waterproof rug which duplicates a map of the Lake District at £39.99? These are light and easy to carry in a backpack. And [a PACMAT print has been developed especially for the National Trust to be put on a] rug which is light and waterproof, with holes for pegs to pin it down. They come with a bag you can attach to a rucksack."