No, unlike at an airport, the Eurostar has no 100ml limit on liquids, and you do not need to place them in a small, clear plastic bag for security. You can bring full-sized bottles of shampoo, wine, perfume, or water in your luggage without any restriction on volume. This is one of the most significant advantages of rail travel between London, Paris, and Brussels in 2026. The security screening for Eurostar is primarily focused on identifying weapons and dangerous items rather than checking for "prohibited liquids." However, there are limits on alcohol consumption: passengers are generally permitted to bring a reasonable amount of alcohol for the journey (typically one bottle of wine or four cans of beer per person), but large quantities or "party-sized" amounts are not allowed on board. While your bags still go through an X-ray machine and you must walk through a metal detector, the process is significantly more relaxed than the TSA or Heathrow protocols. You can simply leave your toiletries inside your suitcase and keep your water bottle in your hand as you move through the terminal at St. Pancras or Gare du Nord.