Rainbow Backpack: possible update

[ChaosPrince]

I say leave it at it is right now.
13x2 = 26, suddently, those 13 people are richer by ~175m (we want to sink the zeny, no overflood it).

Most of the people are broke since the first wave (big money holders are gone/banned, so I doubt we can reach 5 Billion mark) Since most people already spent their million trying to get backpacks.

Finally, I think it's a good idea to trade 5 backpacks for 1 (1 = ~25m, so 125m, they save ~50m, but they also loose 5 backpacks). Balanced.