`H_2O_2` is always stored in plastic bottles ? Why ?

Explanation

The aqueous solution of `H_2O_2` is spontaneously disproportionate to give oxygen. The reaction is slow but it is explosive when it is catalyzed by metal or alkali dissolved from glass. For this reason its solution are stored in plastic bottles
`H_2O_(2(aq))toH_2O_((l))+1//2O_2`