Frito Lay withdraws eco SunChips bags and goes back to lab Frito Lay withdraws eco SunChips bags and goes back to lab 06-Oct-2010 By Jane Byrne Snack maker Frito Lay has reverted to the original non-biodegradable material for five of its six SunChips brand bags after consumer feedback indicated its new 100 per cent plant-based polylactic acid (PLA) packaging was too noisy.