I would get the fill maybe just a CC or 1.5 cc. I know when I get over filled I know right then and their if I am over filled and can't get that Water down. I have made the mistake before thinking I can handle it being a little tight but that is a big mistake. But if u are lose then yes get a cc before ur trip and drink slowly the water they give you after the fill I never felt it go they the band they always asked me do u feel it going thru the band. Was like IDk. Lol. But if you feel tight in your chest when u are drinking it then it is a little to tight. I rather have a fill before I went on a vacation then be lose and eat crap I know I should not but can and feel like crap. .