Help!

Baking in Canada is exceedingly frustrating at times. Most of the recipes I find give measurements in ounces, frex 10oz can condensed milk. Which is fine except the products sold here don't give me a measurement in ounces, we have mililiters. Which is annoying to convert but ok. Now is where we get to the part where I need help. Does anyone know if a "16 oz can of maraschino cherries" is in fl. oz, or regular ounces? My can is in mililiters, a volume measurement. It matters weight or volume because the conversion is different, unless it's water, then it's pretty close.

Who decided having the same unit for weight and volume was a good idea? Confusing imperial system...