blue bag drop rate?

Okay so, in 5 minutes of farming:

http://i.imgur.com/mhDf9kS.png


http://i.imgur.com/9sbfDo5.png


http://i.imgur.com/z9hSPME.png


wtf is this drope rate :c

dude, i think max my rogue 3/8 will be a bit more easy o.o