Hi Sonia!
I'm drinking out of a Walt Disney World refillable mug right now! They make excellent cups for home use as well. They are insulated tall cups with handles and a lid and are included with the
Disney Dining Plan or you can purchase if you are not on the plan. The lid is the type that you slide in a circle to expose the drinking hole. They do not come with straws, but you can pick a straw up at any drink station to use. They are refillable at any Walt Disney World Resort hotel, but not in the parks. We like to fill our mugs in the morning and take them to the park with us. We have a multiple cup holder attachment for our stroller, so bringing them with us isn't an issue. If you don't have a place to put them, carrying them throughout the day might be a little inconvenient. Even though they aren't refillable in the parks, I still bring them and pour any drinks we purchase during the day in them since they are insulated. The kids also like having their own specified drinking cup.
If you are carrying a backpack and it has side cup holders, you can try to put them in there. Since the cups have a handle, they sometimes won't fit securely in those pouches. If you can fit them in there, be mindful when bending over. I have had a surprise wet back on a few occasions.
If you'd like to see what the cups looks like, copy and paste "Walt Disney World Refillable Mug" into a Google image search and you'll see tons of photos of the actual mugs.
Have a magical day!
Leslie