Up to 20,000 lb of bombs in two internal weapons bays rated at 10,000 lb each.
Typical load was:
4 × 4,000 lb bombs, or
8 × 2,000 lb bombs, or
12 × 1,000 lb bombs, or
40 × 500 lb bombs, or
50 × 300 lb bombs, or
80 × 100 lb bombs.
Well that's a lot. Especially the 500 and 300 lbers. The 1st three load outs don't look out of line compared to the Lancaster.