Can you list the 20oz and 40oz tumblers in the same listing?
Absolutely! Listing them together is a wonderful opportunity to use the 20oz tumbler as a loss leader for pricing. Just remember to be clear with your options on Etsy by using the mockup that shows the two side-by-side somewhere in your photos (doesn’t have to be the main thumbnail).

Then link the variations to individual photos in your Etsy listing by going to the Manage Variations button in the Variations section. This will help to avoid confusion when the buyer orders.
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