The method of storing of H₂O₂ is

H₂O₂ is stored in wax coated glass (or) plastic bottles in dark ,with a small quantity of urea as stabilizer.

H2O2 is stored in wax  coated glass (or) plastic bottles in drak, with a small quantity of urea as stabilizer.
Presence of metal surface, traces of alkali [present in glass etc., ] increases H2O2${\mathrm{H}}_2{\mathrm{O}}_2$ decomposition.