Welll....all I can say is 4 people inspected that load - and I was present - before it was carried and not one person expressed any concern the net was too small. If the pilot had any concern about the size of the net he didn't say so, and in any event if he thought the net was too small that load wouldn't have flown. The load flew well at 90 kts and the three of us on-board were all surprised when the drums fell out of the net. It wasn't until later we learned the pallet in the empty net had actually hit the aircraft. The net wasn't jettisoned, it stayed attached to the hook. There may not have been a bigger net at the heliport that day, but there were bigger nets available offshore, BBMT and elsewhere within the organization that might have been used. And plan B might have been to break it up into 2 loads of 2 drums but, as I say, nobody expressed any concern about the size of the net so a larger net wasn't requested and it was done as a single load. Anyway, moving on....