Vopuk Shrelok does not give the shralok pack. He gives the shiny brass idol. The shiny brass halberd comes from Hagnis Shralok and the shrelok pack comes from the other shralok(forgot his name) which is much rarer then the other 2 named spawns. I have all three items so I know what I'm talking about.
EEbag is 75% if thisbag was that much it would be worth 1000's unfortunetly it's not. Its only worth a couple of hundred at the most and has 25% reduction.
Maybe the Evil Eye Bag has 75% weight reduction, but Shralok doesn't drop it, he only drops the Shralok Pack, which looks just like the Mage's Dimensional Pack. It has 8 slots and 25% weight reduction.