[MightyDog]

Originally Posted by Topspinmo

Getting Pepsi bundled bottles at Walmart that seems collapsed/deflated or vacuumed sucking bottle in? This has happened three times in last month. I don’t trust this and throw them in trash. Ok, if don’t shop at Walmart and don’t drink Pepsi this probably don’t concern you.

How can I restore the shape of a deflated soda plastic bottle without breaking or opening the twist cap? - Lifehacks Stack Exchange

Found this, but I still don’t trust it.

If they aren't like that when you buy them but, become that way after having them at home - where are you storing them?

If in a high temperature area, like a garage or shed, that is likely affecting the plastic. Also, plastics in high heat can leach into beverage bottles - not a good thing.

Or if you keep them in the fridge but, Walmart had them stored in a hot area, that significant temperature shift could be causing that to happen.