Traveling is hard

I have such a hard time when I travel.  Even when I do my best to make healthy choices and not go crazy on my calories, I still seem to gain weight.  I know that alot of it has to do with water weight from the long car rides and plane rides, but it gets depressing.  I can go away for a weekend, exercise while I am away and still come back 10 lbs heavier.  Yes, that is TEN ponds in less than 48 hours.  How does that happen.... Sheesh... The good news in, I lost 5 lbs the next day, however I still have an additional 3 lbs to go, since I lost 2 more the third day back.  I am looking forward, to getting back to0 where I began, then I have to go on another trip.  It's a never ending cycle.