Whereas American recognised the limitations of this fare for passengers and revoked the rule, United are still holding strong only allowing passengers to bring a personal item for free. (https://www.united.com/web/en-US/content/travel/inflight/basic-economy-faq.aspx). I have a normal sized backpack that's just slightly over the size limits for United Basic Economy bag requirements. Capacity 19 liters – A full size carry on suitcase has around 45 liters. Allow 1 business day for order processing and then up to 5 business days for delivery. How do I effectively communicate with an airline? Size: 17.5 x 14.5 x 8.5 inches. Our flights were United Basic Economy, where you can only bring a bag that must fit under the seat. You're allowed a small personal item that fits under the seat in front of you, such as a shoulder bag, backpack, laptop bag or other small item that is 9 inches x 10 inches x 17 inches (22 cm x 25 cm x 43 cm) or less. The Synapse 19 would be a fantastic basic economy backpack but they don’t come cheap. If that's fine with you, then by all means risk it like all those other people that other people know have got away with it (though how they know what fare level other people have paid isn't entirely clear..). American and United introduced their basic economy tickets with a carry-on bag ban. I have a rolling backpack that I took on a United basic economy (ta && ta.queueForLoad ? While United’s new basic economy fare could save you $40 – 60 per round trip flight (and only if you don’t pay to check a bag), traveling on a basic economy fare means not being able to check in online in advance (unless you check a bag), and earning significantly fewer base miles and zero premier qualifying miles. The sizer is shown here and it's the light blue (smaller) box that your backpack needs to fit. https://www.united.com/CMS/PublishingImages/baggage/photo_bag_sizer.jpg. United’s Basic Economy rules and how you can avoid some of the pitfalls. Our flights were United Basic Economy, where you can only bring a bag that must fit under the seat. United has two types of economy fares: economy and basic economy. You're not allowed a full-sized carry-on bag unless you're a MileagePlus Premier member or companion traveling on the same reservation, the primary cardmember of a qualifying MileagePlus credit card or a Star Alliance™ Gold member. Does United Basic Economy include a carry on? Thanks! How Strict Is Southwest About Carry On Size? The backpack is not bulky at all. From the UA Basic Economy page, this might be useful: <