Learn something new (almost) every day. I never knew that maple syrup sold in Canada could only be sold in specific sizes. According the the Department of Justice...

SCHEDULE V.I

(Subsection 10(3))

CONTAINER SIZES FOR MAPLE SYRUP


1. 250 mL or less (sizes in whole numbers)
2. 375 mL
3. 500 mL
4. 19 fl oz (540 mL)
5. 750 mL
6. 1 L
7. 1.5 L
8. Any whole-number multiple of 1 L
I don't see any issues with it though. Just try to find a bottle that is not one of those sizes and besides, what other size would you want to sell? I just never knew it was law.