I had to move recently and will setting up the “lab” again i noticed many bottles had irregular mis-shapenness (made up word? Lol) and i quickly realized that the flavor were actually eating the plastic as “thin” spots in the bottles could be felt where the bottles had deformed. The worst of the bunch a bubble gum flavoring stored in a supposedly safe HDPE bottle whose lid was slowly melting and actually dripping down into the bottle!
I have noticed the LDPE bottles will not keep flavors or eliquids well and both finished juice and flavors will darken and expire in said LDPE bottles. Soneone mentioned the Cap 15ml bottles containing one of there first ever expired flavoring. I know @BoDarc has mentioned the necessity of glass but i believe his warning has mostly been ignored (by myself as well lol)
Long story short i think we should push for resellers/rebottlers to sell in glass and glass only!
I for one would gladly pay slightly more instead of having the pain of transferring everything over to glass myself.
Here are pics of the damage.
This is a serious issue and potential health hazard