I got these as a gift for my dad along with a beautiful leather cover for this size that I got on Etsy.  They don't need a cover though, but it is really nice looking and can be refilled endlessly with this style/size of moleskine cahier.  My dad keeps a journal with him all the time and this is his favorite size as it fits easily in his pocket.  He has used these for years and they survive well over time.