To make this clear.
For giveaway #1 there is 150 prizes in total.
Each winner gets a pack with 3 prizes in it meaning there can be a total of 50 winners.
To pick and confirm the winners the 50 are broken down in to 10's set 1,2,3,4,5
When they are all picked set 1 will get PM'ed and the prizes for that set will be posted. When they have gone set 2 will get PM'ed etc etc.