These leakproof bags are fabulous for carrying a spare pair of knickers with you, if you are having an extra heavy period and need the extra security of knowing you have a spare on hand or are on a night out and know you are going to be jumping and laughing all night and need an extra pair of knickers for those uncontrollable leaks... then this bag is perfect, spare pair ready, just change into the new pair, fold the used pair and pop it in the bag and you are good to go again...Out with the old pair and in with the new pair, feel fresh and comfortable again whilst the bag hides the old pair....