I keep mine inside the house by my desk and they are stored in a large clear box (plastics still in their original bags) until I need to restock my tackle box. During the hot summer months, I bring my tackle box inside the house. I keep enough plastics in my tackle box to get me through several trips and then just replenish as needed.
"But God demonstrates His own for love for us in this: while we were still sinners, Christ died for us." (Romans 5:8)