For decades, we’ve faced an impossible trade-off with paper packaging. Instead of using synthetic surfactants to stabilize oil droplets suspended in water, solid particles do the work. The polyvinyl alcohol builds a dense hydrogen-bonded network that reinforces the paper mechanically whilst contributing oil resistance. But the fundamental approach (designing materials where recyclability and performance emerge from the same molecular architecture) suggests a path forward for paper packaging in applications currently dominated by plastics. The coating that vanishes in hot water might be exactly what’s needed to make paper packaging visible as a serious alternative to plastics.