How are you defining good?
I have some cheap ones at home I ordered a 8 of because I liked them (originally got one from wal-mart) They fit in my water bottle holder snugly, and they're flexible since I like squeezing the bottles when I get a drink. They're bright colored, but semi-clear. They hold 32 ounces. Sometimes if I'm not careful putting the lid on, they'll leak. My first 2 lasted 2 years before I replaced them, but like I said, they were cheap.