Storage of commercial juice in soft plastic query

[Old Goat]

Hi All
Am hoping someone might be knowledgeable with regards to plastic bottles!!
My favorite commercial liquid ( IVG Vanilla Custard Biscuit!!) Used to come in the hard type plastic bottle with those impossible to open cone shaped grooved lids. I have had quite a stash as stockpiled when heard about possible flavour bans etc! All my stash have only been purchased during the last 8 months and are a couple of years away from expiry dates. All stored in a dark cool cupboard.
Anyway they changed the packaging to a new soft easy to squeeze plastic and a flat shaped lid. Much easier to use but the flavour is totally different! Its not so sweet and got a nasty off taste. This isn’t a bad batch as I’ve tried numerous bottles with different batch codes and expiry dates, tried in different vape kits and new and used pods. For reference these are 10mg nic salts 50/50. I’ve contacted ivg to enquire if the recipe was changed and they’ve contacted me back confirming nothing recipe wise was changed just the type of plastics used They did say maybe the plastic affects the flavour when steeped for a long duration etc and am assuming this is the case, but the ones only made 4 months ago have the same off taste. Not vapers tongue as a friend who also rotates with this flavour has noticed the same. And this change of flavour is only with the new plastic
Is this possible that the type of plastic bottle can totally alter the flavour? Is it worth for future reference decanting into glass bottles for storage for several months? Interestingly the shortfills with same expiry date taste lovely like the original flavour! Anyone got any ideas? I’m currently getting down them by mixing with the shortfills in the pod/tank.
Many thanks.

 

[Old Goat]

Ah, the case of the “off-flavour plastic.”

Yes, it’s entirely possible that the new soft bottles are messing with your juice. Certain plastics (especially soft, squeezable ones) can leach tiny compounds into the liquid over time — usually nothing dangerous, but enough to dull sweetness or add a faint chemical note. Hard plastics tend to be more inert, which is why your old stash stayed true.

Couple points to chew on:

Steeping in soft plastic → longer-term storage in these bottles can definitely alter flavor. Four months might be enough for subtle off-notes, especially in sweeter or custardy juices.

Shortfills tasting fine → supports the theory: likely the bottle, not the juice itself.

Decanting into glass → absolutely worth it if you plan to store for months. Glass is neutral and keeps your flavour intact.

Your current “mix with shortfills” strategy is smart — a good way to salvage it without wasting juice. For future reference, if you plan to stockpile, invest in glass bottles for any long-term storage, especially with custards, creams, or heavily sweetened liquids.

Moral of the herd: the juice isn’t always at fault — sometimes it’s the bottle playing tricks.