What Is The Biffy Bag? The Biffy Bag brand personal disposable toilet system is a complete toilet that fits in the palm of your hand. Its small compact size makes it convenient to carry in your purse, pocket, glove box, tackle box or back pack. Its unique comfort fit design allows for a natural position and eliminates the need for lugging around an extra bucket or commode. It has everything you need for a sanitary, discrete and comfortable experience. It truly is a “Biffy in a Jiffy.”