Holdster – Leather Mason Jar Travel Mug:: What an awesome idea! Mason jars are renown for being cheap and indestructible as well as commonly used in serving beverages. When out at a restaurant, if I see a fellow patron drinking something out of one, I’ll generally ask to have what their having. Anyway, this hand stitched, full-grain leather, insulating jar sleeve with a handle really works well for hot drinks like coffee and coco. Feels right drinking a stout or porter out of too.