I put a flash drive with digital copies of important paperwork, solar panels, comm gear, rechargable batteries, tablet, a few items for the kids a multiband receiver and a few other items in a WP bag and put that in an ammo can. I removed the rubber o-ring in the lid of the can and fashion a metal gasket out of some old lead sheeting I had. Then taped up the lid with duct tape to help seal out moisture.
Also metal trash cans with attention paid to seals and handle holes are an easy large scale EMP shield. Just put everything in paper bags or boxes as a dielectric to insulate them from the can itself.
Think simple and solid. Lots of ways to block all three types of EMP.
Just kidding. Stay prepared.
Sounds pretty good. An individual claiming to be an EE posted some information that a large metal trash can with a tightly sealed lid lined with a plastic trash bag lined with aluminum foil lined with another trash bag would provide effective protection. I would ground it. This is inexpensive and could be large enough to hold a bunch of stuff one might want to protect. Not on subject but plastic trash cans filled with water will protect against radiation, gamma, beta, and neutron. Two feet of water will reduce gamma dose by a factor of ten. And provide drinking water when shielding is no longer needed.