I spend a lot of time traveling and outdoors; and carrying around a full size water bottle and finding someplace to store it was getting a little annoying. The Gatorade kids bottle holds 12 oz, which is just enough because I have access to refill it throughout the day, it's also a bit more compact than a full size bottle and easily fits in my purse pocket without weighing it down; but it is big enough to fit in a bicycle water bottle holder. In terms of insulation, while it advertises that it keeps ice for up to 24 hours, I tested it out and found that I got around 8 hours before it was completely melted. I also love that the lid comes with a carrying loop, so I am able to use a clip to attach it to my purse, just in case it falls out, it's not completely lost.