An editorial checklist focused on preventable packing and access problems at a security checkpoint.
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A preventable problem is having no idea what remains in the bag from daily use. Empty it before a flight, including the small pockets, then repack deliberately. That is more reliable than adding clothes on top of yesterday’s work, gym or hobby equipment.
Another is burying items that may need separate attention. Group toiletries and keep the computer accessible if you are carrying one. Delta’s security summary describes the ordinary liquids arrangement as containers no larger than 3.4 ounces or 100 milliliters in a single clear quart-size bag, while noting that special provisions apply to certain necessary items. Use the relevant official guidance for your circumstances.
Avoid assuming a half-empty large bottle counts as a small container, or that a convenient laptop opening guarantees the computer can remain inside. Instructions can depend on the screening setup; follow the staff at your lane.
Finally, leave enough room to put inspected items back without forcing the zippers. A backpack packed at absolute capacity can be awkward to restore after a check. Before approaching the queue, finish organizing loose pocket contents and know where your travel documents are.