What are some sippy cups i can buy for my 1 year old boy?

So um my 1 year old still uses his bottle for his milk. lol sadly.. hes my 1st so im not taking it away yet but now i want to because my sister in laws keep bitching at me.. but idk what kind pf sippy cups are good to start off ? He drinks out of sippy cups but only for water or juice…. They are small.. but i want a bigger sippy cup for his milk at night… but idk whats a good one out there… he uses MAM bottles so he likes the nipple on that but idk i need help finding a big boy cup for 1 year olds