On Delta Air Lines, you are generally allowed to bring one carry-on bag and one personal item free of charge on almost all flights (excluding Basic Economy on certain international routes where specifically noted). The "carry-on bag" is typically your suitcase, which must fit in the overhead bin and should not exceed 22 x 14 x 9 inches. The "personal item" is your backpack, which must be small enough to fit completely under the seat in front of you. Common personal items include purses, laptop bags, or small backpacks. Delta is known for being relatively lenient with carry-on weights compared to European budget airlines, but they are strict about the size of the bags. If the flight is very full, gate agents may ask you to "gate check" your suitcase for free, but you will always be allowed to keep your personal backpack with you in the cabin. This "one-plus-one" rule is the standard for 2026 travel, allowing passengers to keep their essentials close while stowing larger gear in the bins.