Galen Leather is run by a brother and sister team out of Istanbul, Turkey. They specialize in handmade leather goods and have a growing line of products for stationery nerds like me. The No. 55 Leather Field Notes Cover is a beefy cover made out of 2-4mm vegetable tanned cow leather with room for a pen and several cards. It is available in a variety of colours for $34 USD at the time of publishing.