How can I store chopped onions in the fridge without the smell? I am cooking for a large group and am trying to do as much as I can in advance.  One thing I would love to do in advance is chop several onions.  I have done this before with a single onion; I stored the chopped onion in a plastic storage container (sealed with the lid) in the fridge.  About 6 hours later, the smell of onions was very strong both in the fridge and on everything that was in the fridge.  I can't imagine it with 4-6 onions!

What can I do to avoid the smell, not ruin everything in my fridge, but still be able to do the preparation 6-8 hours in advance?
I regularly store chopped onion in my refrigerator (or at least halves &amp; quarters). 

I either use tight-sealing plastic containers or zip-top bags. You may want to double-bag in zip-tops to be sure to avoid a smell. 

One problem you may be having is onion-ness getting on the outside of the container. Be sure the outside is all clean and dry - no point in having a nicely sealed packet of onion when the outside can get all stinky anyway.