Mix together oregano, sweet pepper and hot pepper flakes, and divide equally between 4 hot, sterilized, pint-size (500 mL) jars. Add a clove of garlic to each jar and fill with carrots, leaving 1/2 inch (1 cm) headspace. Meanwhile, in a medium saucepan, combine vinegar, sugar, water and salt; bring to a boil.
Pour hot liquid over carrots to within 1/2 inch (1 cm) of rim. Remove any trapped air from jars by inserting a small wooden or plastic spatula between the carrots.
Process in hot water bath, following directions below.
Makes 4 pint (500 ml) jars.