If individuals want to automatically refuse foreign mail or block all mail from a specific sender, they must submit a written request to the USPS to withhold correspondence for up to two years.
1 liter = 33.8140226 US fluid ounces. 1 US fluid ounce = 0.0295735297 liters. Note that this is for fluid ounces, not dry ounces. A fluid ounce is a measure of volume, just like a liter is. A dry ounce is a measure of weight.
Fluid Ounces Liters* 1 pint 2 cups 16 fluid ounces .47 liters 1 quart 4 cups/2 pints 32 fluid ounces .95 liters 1 gallon 16 cups/4 quarts 128 fluid ounces 3.8 liters