IMC :: trump traveler

The well prepared traveler protects their trumps with a hard leather case that also guards against water and muck. The image shown is a modern variant.
Leather Playing Card Case And Cards
The protection of this modern version is basic and allows quick use of cards.
Older case designs are actually a topless box (which covers 90% of the inserted cards along the long direction.) Cards slide into the top nearly full length. This holder then slides within a bottomless box cover. There is usually a strap or thong closure. If the top liner has three bands of felt or rubber, your cards will generally do well.
Choosy Trump artists will also wrap their cards in silk or waxed linen before encasing them. The only thing more embarrassing than having your cards taken from you by a foe is ruining your cards in a river or a storm at sea.