Yea, I think it's OK to place them all in the same bag, esp for a short while. I too think it depends more on the health of the fish and the environment from which they came, than it does the bag they are put in.
I recently bought 5 tiger barbs, 2 or 3 died within a few days. I went back and got 10 (all in the same bag), none have died and it's been around 2+ weeks.
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