The Ditty bag is an ultralight hiking storage sack, in a coated lightweight Tyvek material. These ultralight products from re-inforced Tyvek material are perfect help you organize and access your stuff wherever you may be. All you need is a place for your stuff. The Ditty Bag is made from re-inforced Tyvek material to help you organize and access your stuff wherever you may be. Use the small Ditty for your first aid, cooking or personal items.