The most common are #1 and designed for one time use. They leach Xenoestrogens which is linked to cancer and other hormonal disfucntions. #7 while they typically look nice, also do this. Especially when exposed to heat and sunlight. #2, #4 and #5 are your best for reuse; but again, don’t let your water, etc sit long or in a warm atmosphere. If you buy water that has that funky taste. Pour it out!

#1 –>polyethlyene terephthalate	#2 –>high-density polyethylene	#3 –>PVC polyvinyl chloride	#4 –>low-density polyethylene
#5 –> polypropylene	#6 –>polystyrene / expanded	#7 –> resins or multi-materials