We offer two sizes for the replacement cap:

1. 500ml

2. 1000ml in Grey and 1000ml in White: Please make sure when you buy a replacement that you replace the exact same color as the one you already have. For example, if your thermos cap was the white one please add the white one to your cart, or if your thermos cap was the grey one then please add the grey one to your cart. 

Make sure to pick your size of choice (and color of the 1000ml) when you add it to your cart.