These bags are used in the safe handling of soiled or contaminated laundry and really solve the problem of cross contamination from patients or babies while cleaning clothes either on a large scale, for example a residential home or just for keeping contaminated clothes separate from your ordinary wash.
The soiled laundry is placed into the lightweight red bag prior to washing and then placed into the washing machine, where the bag is then dissolved by heat and water; this means that you are not touching your clothes again until they come out nice & clean. This sort of laundry management is particularly important when disease is rife in hospitals or care homes or indeed children's nurseries.