Yes, Jet2 is known for strictly enforcing its 10kg hand luggage limit in 2026. While they may not weigh every single bag at the check-in desk, ground staff frequently use scales and sizing crates at the boarding gate, especially on full flights. If your bag exceeds the 10kg weight limit or the 56cm x 45cm x 25cm dimensions, you will be charged an "airport baggage fee" (often around £45) to have the bag tagged and placed in the hold. In 2026, Jet2 also allows one small "under-seat" bag (max 40 x 30 x 20cm) such as a laptop bag or handbag, but this is also subject to size checks. To avoid stress, it is highly recommended to weigh your bag at home; Jet2 is one of the more diligent low-cost carriers regarding these "revenue-protecting" checks to ensure cabin overhead bins don't become dangerously overloaded.