I would wait for failure.... there is no evidence it WILL fail, there just seem to be batches that were prone to failure - at least in my reading. My only thought might be if your FlipPac came from a real wet climate?.... then you might have a point. You can certainly make due out in the field until you get back home if you break one, although it will a pain...
If you do decide to attempt, make sure the lid is 90 degrees open... and even then there may be some slight tension on the bar...