Ok, I am probably the last one to figure this out, but I just found these disposable containers that are perfect for Protein Shakes. Its made by Rubbermaid and is part of their Take-Along line, you know the cheap stuff that if you lose it no big deal. Anyways they make this sports bottle with an attached lid and they come in 3packs. I bought a few packages of them and just add my protein powder to all of them in advance and put them in the cupboard till I'm ready for a shake. This way when I'm on the go I just grab one quick add some water and take it with me or even better yet, when I have to go somewhere and I want a protein shake later on I grab the container and add water whenever I'm ready to drink the shake. If I lose it no biggie cause they are so cheap, and don't have to worry about leaving a shaker anywhere either if I'm out and about.
Hadn't seen any posts for this and just wanted to let people know if my new discovery in case they haven't found them yet. Convenience is sometimes to key to keeping a diet in check and this adds convenience for me anyways.
http://rubbermaid.com/hpd/consumer/p...PFG837101ASTDA