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Keeping this in view, can I take a backpack and carry on Delta?
According to Delta, “If the backpack can get under the seat in front of you, then it will be considered a personal item.” Carry-on bags can be up to 22 x 14 x 9 inches, so if your backpack is bigger than that, it's probably not going in the overhead bin, either. In that case, you can still bring a carry-on.
Moreover, can I bring food in my carry on Delta?
Thanks! According to this page on the TSA web site, you can bring food through security as long as you're sensible about wrapping it up; sandwiches in baggies or tupperware should be OK.
The airline allows one Delta carry-on baggage that must be no bigger than 22 x 14 x 9 inches. Try not to pack any bulky items, and use accessories to your advantage. Packing cubes will help compress your clothes to create more room and maximize your Delta allowance.