My take on the reasons that soylent didn't go with paper packaging (cartons or bag-in-box):
1. Paper packaging is much more fragile than plastic packaging. Boxes permanently dent, buckle when compressed, tear much more easily, etc, when enduring punishment that a plastic container will shrug off. Paper is also much less resistant to water damage. Paper-packaged products like milk cartons or juice boxes are usually transported in durable, rigid-walled crates, and would probably do much worse than the previous plastic bottle in a regular door-delivery use-case.
2. I've always found the relatively low rigidity of the whole assemblage to make sipping directly from a TetraPak sort-of-thing a little slippery and uneasy. The box can warp in all sorts of ways. Maybe I've just been burned by spilling milk on my shirt late at night trying to drink from the carton...
3. Bag-in-box specifically doesn't "scale down" to single servings that well. The experience of drinking out of a bladder within a larger box is less-than-ideal because the bladder can slosh around inside the container. Maybe if they aimed to sell bulk wet Soylent fluid, bag-in-box would be the way to go.
1. Paper packaging is much more fragile than plastic packaging. Boxes permanently dent, buckle when compressed, tear much more easily, etc, when enduring punishment that a plastic container will shrug off. Paper is also much less resistant to water damage. Paper-packaged products like milk cartons or juice boxes are usually transported in durable, rigid-walled crates, and would probably do much worse than the previous plastic bottle in a regular door-delivery use-case.
2. I've always found the relatively low rigidity of the whole assemblage to make sipping directly from a TetraPak sort-of-thing a little slippery and uneasy. The box can warp in all sorts of ways. Maybe I've just been burned by spilling milk on my shirt late at night trying to drink from the carton...
3. Bag-in-box specifically doesn't "scale down" to single servings that well. The experience of drinking out of a bladder within a larger box is less-than-ideal because the bladder can slosh around inside the container. Maybe if they aimed to sell bulk wet Soylent fluid, bag-in-box would be the way to go.