I recently purchased a 2 litre Mammoth Mug. I started working out more regualry and needed to track my water intake to make sure that i was getting enough.
I love that this bottle has markers on it to show you how much you have consumed. The lid is water tight, as well as the mouth spout. The mouth spout is easy to open and close.
I love the wide opening for your hand and it has a good texture for the grip, so if you are sweating during your workout, it wont slip.
I say to people it is also my 4.5lbs weight when it is full, for an added work out.
Love this product!