>I use glass Mason canning jars. They come with a lid and ring but you
>can buy plastic screw on lids. Has worked for me for 2 years.
I'd suggest not using glass that seals. The hydrogen peroxide will
continue to decompose and produce oxygen gas while in storage, which can
produce enough pressure to burst the container (the type of seal on a
mason jar with the two-part lid might be ok for this, but I wouldn't use
it). I've had several exploding glass containers of other things over the
years, and even if the contents isn't nasty the glass can fly quite a
ways.
I've stored the stuff in a brown plastic peroxide bottle, having
squeezed it quite a bit before capping, and had it develop enough
pressure to show stretch lines down the sides of the bottle. The big
plastic ketchup squeeze bottles sound about perfect, since they can vent
the pressure while sealed. The vented gasses will still rust/corrode any
metal nearby...
-Gary