Well, they're not that big yet, but they will be.
The parent to this hybrid is actually the plant formerly known as carunculata var. robusta. It has been combined into bongso by many taxonomists. The pitchers still look different to me, but they're more concerned with the plants other features. Seems a shame to lose the description on a whole segment of plants as the var. robusta seems to be the best looking pitchers, IMO. I have seen some people use the name bongso var. robusta, but I don't think this is proper. I just use bongso because it is shorter to type.