My spouse had an open box of triscuits in his pantry for a couple years. Ingredients whole wheat, oil, salt. His house was so humid that anything left on the floor (backpacks etc) for more than a day or two would have water under them. I had Dandyblend powder in a ziploc bag and it turned to goo in a few weeks.

The open triscuits looked perfect. I will never touch another one 🤢 that's not food.