A serious shield for a room — conductive surfaces, bonded seams, filtered penetrations for power and data — is construction. It makes sense for a radio room, a small server, a clinic’s critical closet. It does not make sense as a default kitchen remodel.

Every conductor that enters is a hole unless it is treated as one. Filtered penetrations are how power or data comes in without a free copper path around the wall. Bonded seams are the admission that a gap is also a path. If a few specific machines do not have to stay connected inside that room, the construction price is the wrong price.

The two projects get confused in conversation. A closet is quoted as if it were a product you can order, or a bag is discussed as if it were a room. The room is for gear that must remain in place and on a feed. The box is for gear that is allowed to wait, unplugged, until someone needs it.

The weekend version is a known-good box for a radio, a solar charger, copies of documents, and spare batteries. Test the box. Most failures are the cable someone left plugged in, which cheerfully conducts the outside to the inside.

The test is the lid. What you mean to protect goes in, the lid closes all the way, and no cord is left out "just for now." Copies of documents belong in there because a long outage is also when you need a policy number, an identity, or a map that had been living on a drive you cannot open.

Batteries stored in a different drawer are not spare at the moment you open the box. A charger that only works on the house current is not the charger for this problem. The set inside should be able to do its first job alone. If it cannot, the box is a drawer with a reputation.

Spend the rest of the budget on water, relationships, and a transfer switch. Glamour is not a threat model. A sealed radio beside an empty jug is a hobby. Water, a person who shares your meetup, and a legal way to run a few circuits will do more on the day than a seamless wall around a kitchen.