Yes, you can effectively "change" your cabin bag to a hold bag on easyJet, but the process usually involves adding a new hold bag to your booking rather than a direct "swap." Every easyJet passenger is entitled to one small under-seat cabin bag (45 x 36 x 20 cm) for free. If you find that your bag is too large or you simply want to check it, you can go into the "Manage Bookings" section of the easyJet app or website and pay to add a 15kg, 23kg, or 32kg hold bag. It is significantly cheaper to do this online in advance than to wait until you are at the airport. If you show up at the gate with a bag that exceeds your cabin allowance, easyJet will force you to put it in the hold and charge a steep "gate-check" fee (often £48 or more). If you have already paid for a "large cabin bag" (56 x 45 x 25 cm) but the overhead bins are full, the airline may put your bag in the hold for free, but this is at their discretion. To avoid high fees, it is always best to finalize your baggage strategy at least two hours before your flight departs.