Are objects in employee walkways legal? What about 10ft stacks of 30lbs. bags that tip on us?

I just answered your other question, holy crap you work at a terrible office. Allow me to again recommend checking out OSHA regulations. Are you at risk for tripping, slipping, etc.? What about fire safety, is your path to an exit impeded in the event of a fire? Dealing with hazards such as sharp protruding objects? Read the link, OSHA pretty much explicitly says that the things you're dealing with are against regulations and should be remedied by your employer.

Find a new job.

Yep, that's a problem.

The most effective way you get this handled is to innocently ask the fire department if it's a fire hazard. Call on their non-emergency line. They'll come out and do an inspection- those stacks are going to hinder your getting out to a fire exit- and it'll be cleaned up. Probably by you.

So clean it up.

You work there, get to work.