I’ve been using Soylent since its initial 1.0 release and been on this forum for years, but I only switched to 2.0 a few months ago. The bottle did have a foil seal, and it was the bottom of the bottle that failed, not the top.
I did not handle the backpack roughly, but it was 87 degrees outside and perhaps that was enough to increase the pressure inside the bottle to the breaking point (although I would hope the bottle could withstand higher temperatures than that). My concern is whether this indicates that all Soylent bottles are prone to failure in outdoor temperatures (I live in Seattle, so usually it is quite cool, this is the first time I think I’ve had a bottle outside in over 80 degrees).
Even if it’s a 1 out of 300 kind of thing, I wish someone had warned me “Don’t trust the Soylent 2.0 bottles”, because trust means I put it in a compartment with important papers and electronics. Lack of trust means I have to put the bottle inside of something else, like a ziploc bag, or not bring it at all. This is why I shared this information – if the situation were reversed and it had happened to someone else, I would want to know there is a reliability issue so I would be forewarned. I’ve never had this problem, for example, with a sealed drinking water bottle (which has plastic even thinner than soylent bottles, I think).