On Eurostar services, a backpack is considered one of your allowed pieces of luggage, but where it fits in the hierarchy depends on its size. Eurostar's baggage policy is relatively generous compared to airlines; standard adult passengers are allowed two pieces of luggage (up to 85cm long) plus one small piece of hand luggage, such as a handbag or a small daypack. If you are carrying a large trekking backpack, it counts as one of your two main "large" items. If it is a standard school-sized or laptop backpack, it is treated as your "small" hand luggage. Unlike airlines, Eurostar does not have strict weight limits for these bags, provided you can safely carry and lift them into the luggage racks yourself. It is important to note that the small hand luggage item should be kept with you at your seat or in the rack above your head, while larger backpacks must be placed in the designated luggage areas at the ends of each carriage. Security at the station will X-ray all bags, including your backpack, but there are no "liquid restrictions" like at an airport, meaning you can keep your full-sized toiletries or a bottle of water inside your bag during the journey.