Part of the problem is that the baggage allowance is too high, but the 737NG isn't known for carrying a lot of cargo anyway. Non of the narrowbodies are. They usually only carry mail which is separately contracted. The 737 also has a comparitively smaller cargo hold, that is not industry standard (such as the A320 series cargo hold)
Just curious.
My 737-700 shows 0 kg of cargo capacity while a B738 has 6000 kgs and an ERJ145 in my fleet has 5800 kgs.
Is there a bug or is that just -700 series?