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Most domestic one item per passenger is set at 2 , with items having size specifications. However, the second one item which may be a personal item like a backpack, purse or briefcase is the major must have a minimal measurement of 18” x 14” x 8′ . The checked items have an allowance of 2 per airline depending on the airline of interest and one per airline where each item cannot be more than 62” linear and weight more than 50 lbs.