I started with one of the 30 oz Tumblers (in plain stainless), the lid with straw and the handle about 3 years ago. Love the thing! I don't use any other cup except this one anymore!

Fast-forward a few months and now my girlfriend wants one, so she gets the same thing but in Reef Blue. She still uses other cups, but this is her main one.

Fast-forward to a couple of weeks ago, a co-worker was showing me a water bottle (that he got from Wal-Mart or something) that he keeps in his backpack. I thought this a good idea so I went and bought a 26 oz Ramble Bottle and the 5 oz Cup Cap. Works great... almost too great. I put a 16oz bottle of water in it, and fill the rest of the way with ice. I finish the water and the damn ice hasn't really melted! I tinkered with the ice to water ratio and prep methods and found the following to work best:

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Place bottle in freezer (EMPTY!!!!) overnight.
In the morning when I get up, go straight to the kitchen and put two bottles of water from the fridge to the freezer.
Do morning "get ready for work" activities.
Take bottle and put 4-8 ice cubes (depending on size) into bottle and fill with water from two bottles placed in freezer.
Cap. Take remains of 2nd water bottle to top off Rambler Bottle later.

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Worked pretty good for me, but I still wanted more capacity. So I went and bought the 36 oz bottle today. Already been washed, dried, and now chilling in the freezer (empty of course). We'll see how this works.

Of course the g/f went with me today, and she bought one of the 18oz bottles. Any now my son wants one of the bowls for his dog.