Thanks, Isaac. I was trying to estimate the size of the pitchers from your photos and I was right about them being 5"-6".
Leaves over 1ft will be a headache for me.
How is your light level like? Does the plant/pitcher receive direct sunlight? I have two northiana plants at the balcony. One receive direct sunlight for part of the day while another one is in shade. The one in shade is producing darker coloured pitchers with more red stripes/speckles.