Seen this happening a couple of weeks ago at the Golmar. Quite a well-to-do looking English 'lady' too, took an empty juice bottle up and filled it up, returned to her table and put it in her bag.....then lo and behold another empty bottle appeared and also got filled up. She also came back to her table with boiled eggs but they seemed to disappear - unless she ate the egg shell
A couple of years ago it was Slovakian children who were raiding the buffet and yes they had backpacks, and their practice was to fill the juice into tumblers, return to their table then
transfer it into a 2 litre bottle...took quite a few trips to the dispensers for that.
I wish the hotels would do something about this, I find it quite annoying.....if you can't afford to go on holiday then you shouldn't be there. No wonder the price of hotels/holidays keep going up