Question on protein exposed to air

[Chiron]

Hey, I was just making a PWO shake and I noticed my tub of protein had a small crack in it where there was a dent. It was a really thin slight but I could see through it. The powder seemed to smell about the same. I'm not sure if it smelled a little different or it was in my head. Anyway, does anyone have an idea what happens if protein powder is exposed to small amounts of air for, say, a few weeks?

[Aoife]

Doesn't air get in the tub every time you open it?

[Leigh P.]

For that amount of time you are fine, heck you could even go longer. Protein powder is really not a senstive substance.