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The garbage bags are good ideas. The fabric on the litter box can absorb fumes though so it may be a good idea to remove it from the apartment for the same amount of times as the cat. You can also go and get a plastic litter box which won't absorb the fumes.
If you are taking your cat to the hotel for a few days just take the litter box with you so you don't need to go get a new one or worry about the fabric one getting contaminated.