Even though we spent most of our time in the parks last time, we still bought 2 of them for the 4 of us. We would fill them in the morning before we ate breakfast in our room and we would also fill them at night when we got back to the resort. I thought it was worth the money. Just note that they are not refillable inside the parks. I see people carrying them through the parks and often wonder why they are going through the hassle. Maybe they just didn't know they didn't work in the parks or maybe they just wanted to fill them with water.