My instructor told me to avoid hanging anything that could flop around on my backplate and cause an entanglement hazard. I guess that would apply to a bungee'd lift bag.
As far as what an MC Storage Pak costs, it's the equivalent of what my brother spends on gaz and oil for his Seadoo in one day, plus it's a one time purchase and no maintenance...:14:
Cost is no issue... The problem is not everyone dives a Halcyon plate. If you don't dive an H plate, the MC pack probably won't fit your plate. I guess everyone has to dive an H plate, then? I know that's not the answer, so the question becomes what is the best method when the MC pack is not an option. Looks like the best candidate thus far is the bungee method.