Muriatic Acid - sealed, in a bag, in a steel drawer - looks like rust under the bag!?

[metric_taper]

The shelving at the home supply where muriatic acid is kept, look at the steel shelves, if the acid has been stored there, they are all rusty.
Metalworking forums talk about where a bottle left in a machine shop caused all the tables and ways to develop a rust film. I store mine outside, I place the original plastic bottle into a 5 gallon dry wall mud bucket, and snap the lid on tight.
Glass storage may help, but the threaded cap will not seal perfect, and you know a metal lid will soon be open air.