BlenderBottleGoStak Twist n' Lock Storage Jars, 40cc 4-Pak, Black

If you are purchasing these to carry single servings of your protein powder, then the 100cc size is what you want. A single 35 gram serving of protein powder will fit exactly within the 100cc GoStak storage container, with no room to spare. As you can see from the photos I attached, the first picture is of the container with exactly 35 grams of protein powder measured out. The container is filled to the brim, and you have to gently tamp down the powder slightly.This is fine for my uses, since I only need each container to have a single serving of vanilla protein powder. However, if you have additional mix-ins (such as creatine, cocoa powder), you will not have enough room to add them. Different brands of protein powders also have different serving sizes: some brands are 30 grams per serving, in which you'll have a bit more room to spare, but if your brand is 35 grams per serving, than you can fit exactly that and no more.Furthermore, I'm happy to share that the containers fit perfectly inside a Yeti Lunchbox cooler. As you can see from the third picture, the twisted together containers fit in the vertical space perfectly. You'll have enough room to pack a box of food, as well as your utensils and a banana.Overall, I'm very satisfied with the product, but be careful of the size that you need. If you enjoy your protein powder without any add-ins, and a single serving of your powder is between 30 to 35 grams, then go for the 100cc size. Otherwise, you will want a larger size. I'm not sure if the smaller sizes are useful, except for sauces or vitamins.

Me encanto este producto; la medida que adquirí fue mas que suficiente para poder empacar mi proteína del gym que casi que lleno y no ocupa tanto espacio; además el modelos y color combinan con todo

A solid stackable protein/vitamin storage option. It stacks on and off with a twist. Solid feeling and a great price.

Great containers but they absolutely do not fit anywhere to 35g of protein powder like one review says (only reason I bought them). I could only fit 14g of protein powder in the 100cc container.

Stackable containers for protein shakes, I use it for traveling and I put protein shakes, collagen, etc. in them. Nicely sized, good value for the money. Seem to be leakproof but I don't use liquid.

I use these to take whey protein to work everyday. They stack securely into each other for organized travel, don't open on their own and have just enough space for a scoop of my dymatize. After my workout I take one off the stack, dump it straight into my blender bottle and toss the empty in my bag to bring home for a cleaning and refill.

I love these very convenient. I've struggled a lot of my life to find a good container to carry around my protein. So I don't have to carry a big jar or Ziplock bags. These fit the bill

Perfect size for pre-workout and creatine. Great for travel.