Usually they will fit under the bed. If they are too large, ask the cabin steward if he can store the oversized ones for you. They are usually very accommodating. No worries, Mate!
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Darlene

Mariner of the Seas

Carnival Magic Bloggers Cruise 5

Mariner of the Seas
HAL Statendam Alaska Cruise Tour - 09/09/12; Disney Magic - 12/01/12; Allure of the Seas - 05/26/13