LiPo puffing?...hard or soft?...HELP!

[jsr]

A couple of my LiPos look to have puffed. It didn't happen while in use. It actually happened when they were sitting for a couple of weeks. I've had 1 LiPo puff before and it was hard, meaning I couldn't squeeze it, it didn't have much, if any, give.
These 2 packs that look a bit puffy now are soft and easily squeezable. They give easily and bounce back to a slight puff. It looks like just air in there.
When LiPos puff, are they supposed to be hard and unsqueezable with no give? Or are they soft, squuzable, with give and bounce back?
Just trying to check if the 2 LiPos I have now are actually puffing or perhaps just the hot weather we've had lately.

Thanks.