"It is you! If they find out who they've got --! They're Snatchers, they're only looking for truants to sell for gold --"
"Not a bad little haul for one night," Greyback was saying, ... ...
Harry Potter and the Deathly Hallows
I've searched the phrase "Not a bad little haul" and got lots of hits. It seems a quite common phrase, but none of them addressed what it means. What does it mean truly?