Review on Vremi 16oz Stainless Steel Water Bottle - Double Wall Vacuum Insulated Metal Water Bottle for Travel or Gym - BPA Free with Leakproof Lid - Keeps Hot or Cold Drinks - Fits Standard Cup Holders - Black by Rick Rogers

I like this size. It's not too big and fits my hand perfectly. The rubber seal around the lid can be easily removed for cleaning, which is very convenient. Unfortunately, my regular sized ice maker, flat at the bottom and round at the top, doesn't fit through the neck of a bottle. Crushed ice is obviously not a problem so I used it. One day at 8am I filled it up with ice and water and even after I refilled the bottle the next morning there was still ice! The only downside is that it cannot be washed in the dishwasher, so washing it is a bit of a hassle. I took a baby bottle brush to wash it and it seems to work fine.