Other forms: sachets
A sachet is a small cloth bag containing something that smells good. You might use a sachet to keep the tube socks and undies in your drawer smelling nice.
In Britain, people tend to use the word sachet for any small bag or packet, like a sachet of sugar or a sachet of cat food. In North America, a sachet is a more specific kind of small bag, one that's filled with something scented, like lavender or balsam. In either case, sachet is pronounced like the French word it comes from — the second syllable sounds like shay.