I have both the 4oz and 12oz. They both have their purposes.
The 4oz is great for travel or travel mugs. It takes about 2 full phins and is excellent.
The 12oz is just right for your favorite mug at home or work and takes just 1 full phin.
12 oz Phin Filter
This is the perfect filter to make a larger portion of coffee (I drink several cups a day) -- easy to use, clean, and makes the best cup of coffee each time!
Makes great coffee, has a small footprint for a little kitchen, and it's cute!
This is the first coffee phin I've ever bought, and I think it'll be my last. This brewing tool is so simple to use and clean I never want to go back to my normal chemex brewing method. 10/10 would recommend