Each of these All Natural Cotton brewing bags have a drawstrings for a nice tight closure to prevent tea leaves or herbs from slipping out during the brewing process. These bags are made in the USA with 100% All Natural Cotton grown here in the USA! Food Grade & Ready to enhance your tea time experience! This is a delightful and all natural way to brew up a perfect cup of tea! Simply fill the bag with the amount of tea or herbs you desire, pull the drawstrings tight & place it into your hot water. Once your tea is brewed to the strength you desire, just empty out the bag then clean, dry, & reuse these many times!