Loose packs storage?

Hello,

I was wondering what you guys do or think is the best way to store loose packs and 3 pack blisters. I randomly pick them up at target or walmart when im out and about, been doing it since 2012 just never opened them. Right now they are just in a shoe box under my desk. I just dont want my flashfire and lengedary treasure packs getting ruined. Thoughts?