Can I use a Ziploc bag?

A heavy-duty freezer bag is better than nothing, but it is not puncture-proof and can trap humidity inside if not sealed perfectly. A rigid case is safer for long-term travel.

Should I keep my passport in the hotel safe?

Hotel safes are notoriously humid environments. If you must use one, place your passport inside your sealed, silica-packed container before locking it away.

Keeping Your Passport Dry in Humid Climates

Prevent moisture damage by using a silicone-sealed waterproof pouch and adding silica gel packets to your storage container. Avoid leaving your passport in humid hotel rooms or near open windows.

Use a rigid, airtight container. Ditch the fabric passport cover. Purchase a small, hard-shell plastic container or a dedicated IP68-rated waterproof pouch with a double-seal closure.
Add desiccant packets. Place at least two 5-gram food-grade silica gel packets inside your container. These will absorb any residual moisture trapped when you open the bag.
Store away from exterior walls. In tropical climates, exterior walls in hotel rooms often accumulate condensation. Keep your passport bag inside a luggage compartment or a drawer away from the wall.
Avoid temperature shock. Do not move your passport directly from an air-conditioned room into the humid outdoor air. Keep it inside your bag for 15 minutes to allow the temperature to stabilize gradually and prevent condensation from forming on the pages.

Can I use a Ziploc bag?: A heavy-duty freezer bag is better than nothing, but it is not puncture-proof and can trap humidity inside if not sealed perfectly. A rigid case is safer for long-term travel.
Should I keep my passport in the hotel safe?: Hotel safes are notoriously humid environments. If you must use one, place your passport inside your sealed, silica-packed container before locking it away.