Memorial Day weekend often marks the start of summer fun, when many people pull patio furniture, kayaks and golf clubs back out of storage. But for households short on space, self-storage units can help keep seasonal gear, bulky items and overflow clutter out of the garage and basement until they’re needed again. Self-storage has become increasingly common in the U.S. The industry now includes more than 2.1 billion square feet of storage space, and about one in three Americans currently uses self-storage, with another 18% planning to rent a unit in the future, according to SpareFoot . In a recent survey of Kiplinger’s A Step Ahead newsletter readers, 61% said the main reason they rent a storage unit is a lack of space at home. From just $107.88 $24.99 for Kiplinger Personal Finance Become a smarter, better informed investor.…