The south of the bottle is nice, you can push it down to lock it then press the button when your ready for another drink. Stainless steel bottles are my favorite to drink from, this one can keep drinks cold up to 24hrs and keep liquid warm for 6hrs. The BIG downfall for me with this bottle is that you can only wash the lid in the dishwasher, not the bottle. When you have many bottles or other dishes, it's hard to keep up with which have to be hand washed so I end up throwing them into the dishwasher and ruining them.