Here is something different on the stainless steel bottle front. Nathan bottles have an ergonomic grip, funky bright designs and colors (and plain ones too), and a flip straw. The straw part is covered in silicone, has an attached (detachable--and I took mine out) straw under the cap, and a built-in caribiner type latch to hold your keys--smart!
I can't decide if I like the smaller or bigger ones better (they come in different sizes), as the smaller bottles have a super comfortable grip and seem to hold just the right amount of water for errand running while the larger bottles would be ideal for more physical activity. No BPA or toxic anything and innovative design, brilliant.