Note: I have the 8 quart Instant Pot and it works well with one or two racks of ribs (2.5-5 lbs). I tried doing 3 racks, but the middle rack didn't come out as tender. If you are going to do 3 or 4 racks, I recommend doing 2 batches. For each batch, only use 1 cup of apple juice in the bottom of the instant pot.