There is no real reason as you can simply buy larger liquids once through the security check. The reason for the change was that there was a security scare about potential terrorist stacks using liquids they would mix together on a plane to make an explosive.
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In a few words, it's to prevent terrorism.
Airports set limitations on the amount you can carry with you because they can't accurately identify the type of liquid inside bottles by only using their security screening equipment.
You are allowed to bring a quart-sized bag of liquids, aerosols, gels, creams and pastes in your carry-on bag and through the checkpoint. These are limited to travel-sized containers that are 3.4 ounces (100 milliliters) or less per item.
How many 100ml bottles can I take on Ryanair? Each item of Liquid carried must be in a container of no more than 100ml (3.4 ounces); All liquids should be carried in a single, transparent, re-sealable plastic bag of up to 20cm x 20cm with a total capacity of up to 1 litre.
According to the TSA, limiting containers to what can fit inside a quart-size bag prevents what former TSA administrator Kip Hawley once called a “critical diameter” to blow anything up. The size of the container precludes enough of a potentially explosive liquid from being carried on board.
The ban was put in place after British authorities thwarted a plan to blow up a U.S.-bound plane with liquid explosives. There is now technology to send that ban down the drain. Airports across the U.S. are now using X-ray scanners that use CT technology to give guards a 3-D image of your carry-on.
Make sure you know exactly what is considered a liquid before you go as some may surprise you. Mascara is considered a liquid, as is anything deemed 'spreadable. ' Also keep in mind that sharp objects, like razors, might be subject to restrictions.
The TSA rules allow for lipstick to be considered a solid, not a liquid or gel, which means that you do not have to take it out of your carry-on during the security check.
Safety Razors: Because the razor blades are so easy to remove, safety razors are not permitted in your carry-on luggage with the blade. They're fine to pack in your carry-on without the blade. The blades must be stored in your checked luggage. The same applies for straight razors.
Because the TSA considers the nut spread a liquid, plane passengers must limit the amount they bring in their carry-ons. Like all other liquids, passengers are limited to 3.4 oz or less of peanut butter in their carry-on bag, but can also put the snack in their checked baggage.
Placing these items in the small bag and separating from your carry-on baggage facilitates the screening process. Pack items that are in containers larger than 3.4 ounces or 100 milliliters in checked baggage. Any liquid, aerosol, gel, cream or paste that alarms during screening will require additional screening.
You are allowed to bring a quart-sized bag of liquids, aerosols, gels, creams and pastes in your carry-on bag and through the checkpoint. These are limited to travel-sized containers that are 3.4 ounces (100 milliliters) or less per item.
If you want to bring perfume in your hand luggage, you must comply with the “3-1-1 Rule”. This means that it must be in a container with 3.4 ounces (100 millilitres) or less and placed in a single, clear, plastic, sealable bag for inspection.
Liquids include the following: All drinks, including water, alcohol, soups, and syrups. Creams, lotions, oils, perfumes, lip gloss or lip balms, mascara etc. Sprays and pressurized containers including shaving foam and spray deodorants.