I never valued carry loops for water bottles, until I started doing regular outdoor work. Try carrying a bottle with both hands already full of tools, and you’ll change your preference.
Joseph Joseph has an unusual, rather designey take on a water bottle with a carry loop. The loop is part of the cap, and sized to fit around the neck of the bottle:
I don’t think it’s a better solution than a hinged lid, which I prefer, but I could see this product becoming a hit with people who refer to themselves as “design lovers.”