Product review (5 stars): as listed
needed a replacement filter and this is the most convenient way to get it.
Bonus: a year later when you have to buy a new one, you don't have to start the chase of the "right filter for the right price" - just look into your old purchases and reorder it.
The filter itself is shrink-wrapped and then inside a small branded  cardboard box (single unit / 1-pack).
just unpack, pull the sticker that covers the opening (like a yogurt) and then soak/fill with water.
replacement is easy thanks to the bayonet mount: push and turn until it clicks into place. Doesn't make a mess either.
Then you have to run X amount of water through your fridge (it says it on the filter and the instructions on the box) to flush the line inside your fridge... Done...
I love my fridge with the ice maker and cold water dispenser; the water is delicious because of the filter and that's why I change it when it's due (once per year for me).