I love my bkr water bottle! I initially used a smaller one, then upgraded to the full liter size. It's perfect for busy days at the office or super sweaty workout classes, because it holds more water than most bottles. It's all glass inside, so you know nothing creepy is leeching into your water. It's sturdy (never tips over) and pretty solid (the silicone sleeve protects the glass really well.) And it's super cute.
Just ordered the cap that fits a lip balm (because who doesn't need a lip balm with them at all times?!) - excited to try and will report back!
I love both the 500 ml and 1L bkr water bottles. The 1L bottles are the right size for water consumption, though are not great for bringing along on your adventures (purse or work bag) due to their size and weight. That being said, they're an excellent studio workout buddy or water bottle which lives at your desk. For handbag water bottles, my go-to is the 500ml bkr.