Why can’t I find pineapple juice in plastic bottles? The can says to put into a glass or plastic bottle after opening.
Move to Hawaii, they’re everywhere here.
What about canapple in a pie?
OK, I like both these ideas - the can goes in the pie before baking, right :eek:
Should I put sea salt in that pie?
Just a WAG, but once the vacuum in the can is lost due to being opened, the acid in the juice would start to corrode the metal on the can’s insides. Transferring it to glass or plastic will certainly make it taste better;however, most of us can use an iron supplement now and then. 
Check your tetrapak juice section.
I vote with Muffin. I was a bit bemused by the O.P. on the grounds that I thought it was perfectly easy to get pineaple juice in plastic, OK, not bottles, but as Muffin the Tetrapak cartons, usually either a litre or 1.5 litre size. But perhaps your pineapple juice in cans is of better quality? Dunno.
As for the label advising you to transfer it into glass or plastic once opened, I’m pretty sure one is meant to treat any comestible in a can that way (not that I always do - ooh what a daredevil! 
)
And predictably enough, I immediately find myself thinking - mm- not had pineapple juice for a while - reach for shopping list.
My WAG is that pineapple juice tends to separate on standing since it’s got all that yummy thick stuff in it. So it looks less attractive on the shelf in a transparent container.
Yep, but it wouldn’t need to be a transparent container, though. Plenty of coloured bottles around, both glass and plastic. (I’d have thought the sight of the yummy gloopy stuff would actaully help it sell - you know - giving the reassuring notino that it really does come from fruit, not a strange brew of factory gunk, but, I dunno, maybe I’m odd.)