Discover United Airlines Baggage Policy is practical and easy to understand, providing allowances that fit different travel needs. Most passengers can carry a personal item and a carry-on, but Basic Economy does not allow carry-ons in some cases, which can be really inconvenient. Checked baggage fees are different by route and fare but reasonable for both domestic and international travel. MileagePlus members and premium cabin travelers have extra advantages, which makes the policy more attractive. While clear and flexible, fees for oversized or overweight bags may feel steep for some travelers.