Do never bring back weed with you when you come back from Holland.
You could be lucky, but i know for sure they have hemp detectors in the airports and flight or trains coming from the Nederlands are checked too often to be relaxed.
I went to Amsterdam last October, and brought back only a couple of grams of Charas hash, fit into a small plastic bag covered with a tape and then put into my shampoo bottle, that was made of a metal alloy.
I would never do it again. I got to Rome (i'm italian) at 9 pm and there were only to fights landing that time. The baggage claim area was full of police men and dogs, and they were going around the people from Holland hoping (fuck them!) to find something wrong.
I know if they catch you even with 1 joint only, you can be processed for international pushing. I mean, 1 joint!!!
They didn't catch me, luckily, just because the dog who was around me had already catched another guy when my bag arrived, so i just ran out the airport, but i risked, i really risked for 2 grams of hash.
I've been very stupid also because when i was in Amsterdam, i got a book, cut the pages inside (small square cuts only in the middle of the pages, so once you close the book, it looks like it's a new one), and filled it with small packs of marjiuana, always covered with plastic bags and tape. i Put in there about 50 grams, and sent it by standard mail to Rome (prefer not to use priority mail as it's surely more controlled, while a normal pack can be lost within other millions of letter).
Well, i got my 50 grams after 45 days.
My advice is to send packs with no priority mail, it would be better sending it not from Amsterdam, but other small cities around, or even better from Brussels, if you go there by train.
I guess this is the safest way to get weed from Holland, i did it three times and now have a friend who regularly send me some hemp.... and never had a problem.
Do never bring with you anything proibited at the airport.... it's not worth at all... it would be very stupid to "destroy" ones life only for a couple of blades of grass....
Kimo