so that in case you would lose them, you have a back up which will make everything so much easier.
when it comes to traveling, being organized will make things much easier and often quicker. pack everything in the same place every time, so that you can easily see if something is missing.
pack the money and documents in the same different places every time so that you know where you have everything.
we always pack the day before leaving, prepare the day pack if we travel by train and if we fly we put all liquids in the little bags you get at the airport, to avoid the hassle later on. 