The brand new baby sleep bag the pur flo sleep sac is equally revolutionary developed in partnership with experts the pur flo sleep sac provides a totally natural allergy reducing sleeping environment for babies why use sleeping bags suitable for babies from birth the pur flo sleep sac has a 100 cotton outer whilst its silky soft lining is made from bamboo dream a fabric which is made entirely from bamboo fibres this gives the sleep sac anti bacterial properties like no other sleeping