The bum bags are very convenient accessories when you walk your dog. They are lined with a polyester pocket to hide dry dog treats. They have two compartments with a metal zip. The smaller pocket serves as a poop bag holder - you can put a roll of bags into it. The larger one can be disposed of as you wish. You can store private things in it - phone, wallet, headphones, keys, etc. or dog accessories: small, foldable bowls, smaller water bottle, treats, etc.
Hand washing recommended, as machine washing may damage the metal parts.