Yes i have always had the same problem........... go to GNC and get their mixer . It is the best thing i have ever bought from them . It has a measurement scale on the side , Its big enough for any amount , It is easy to clean ,Its only 5 dollars, It also has a little piece that goes in front of the top so when u drink it catches the clumps , if there are any..........
Honestly i would not do with out one of these things. Just put ur protein in and milk or water, shake for like 10 seconds and ur done ...