Yes, you are absolutely allowed to bring your own snacks and cold food in your hand luggage on Jet2 flights. This is a common way for travelers to save money and ensure they have food they like. However, there are two key restrictions: liquids (like soup, pudding, or sauces) must follow the 100ml rule and fit in a clear bag, and hot food or "self-heating" meals/drinks are strictly prohibited for safety reasons. If you are flying to a country outside the UK/EU, you should also be mindful of customs regulations regarding dairy, meat, or fresh produce, which might be fine to eat on the plane but illegal to carry into your destination country. Jet2's standard 10kg hand luggage allowance is quite generous, leaving plenty of room for your favorite treats.