Thanks for the feedback! I'm not going to sell sub-par products when my FO goes bad but definitely want to keep my scents going strong for as long as possible. I'd say I'm a low volume seller by design because my day job is long hours and high stress - I just like a creative outlet. At the same time, I don't want to pour money down the drain, so to speak. I will check the scents that I'm noticing a difference in....that would make sense if they're HDPE. Maybe at the very least, I will swap out my FOs that come in clear plastic even if PET.