...100 ml how many are you allowed in one bag?
The key to the number of bottles 100 ml or smaller that you can carry on is fitting them into a transparent one liter re-sealable bag. It needs to be transparent so that the security agent can visually verify its contents and needs to fit into the one liter volume (i.e. it need to close). If it fits, it flys.
European Commission carry-on liquids rule:
New rules restrict passengers on carrying liquids, aerosols and gels
(LAGs) past screening points, whether on their persons or in their
hand luggage, with the following exemptions:
liquids in individual containers with capacity no greater than 100
milliliters packed in one transparent one-liter re-sealable plastic
liquids which are to be used during the trip for medical purposes or
special dietary requirements, including baby food;
UK liquid hand luggage rule:
There are restrictions on the amount of liquids you can take in your
hand luggage. If possible, pack liquids in your hold baggage (luggage
that you check in).
If you do take liquids in your hand luggage:
containers must hold no more than 100ml containers must be in a
single, transparent, resealable plastic bag, which holds no more than
a litre and measures approximately 20cm x 20cm contents must fit
comfortably inside the bag so it can be sealed the bag must not be
knotted or tied at the top you’re limited to 1 plastic bag per person
you must show the bag at the airport security point.