ProStak Expansion

I purchased this to replace the plastic bags I would commonly use to transport my protein powder to work, or to the gym, primarily because the plastic bags were unreliable and would often tear open or unseal and make a mess. These storage jars work very well and seal very tightly; I have not experienced any leaks or unintentional openings. Additionally, some plastic scoops or containers are affected by static and sometimes cause powder to 'spray' out when pouring between two plastic containers. However, I'm happy to say these storage jars do not appear to have that problem. The storage jars are robust, within reason, and I suspect I will not have any problem with them breaking or opening inside my gym bag. The storage jars did not have any unpleasant odor when first unwrapping them, and they seem to be resistant to developing an odor even after longer-term storage of protein powder. Overall, if you're looking for a reliable method of transporting protein, pre/intra/post-workout, or any other powder, I highly recommend this option.

Great build quality, convenient form factor, and versatile. Fits about 100g protein or meal replacement powder comfortably (you could probably squeeze in an extra 20g or so). Perfect for my use case of portioning Huel servings to use on the go. The containers are the perfect diameter to simply dump the contents into a blender bottle to prep. I don’t use the small pill container portion, but it’s a nice feature if you want somewhere to store something small like pills, vitamins, etc.

Perfect for adding Kachava to my smoothies. For best practices, layer the smoothie and powder in the blender bottle, ensuring that you have smoothie on the bottom layer and smoothie on the top layer before shaking it up. This will prevent the powder from caking up your blender bottle.

These have a million uses. I first found them in varying sizes as part of a Blender Bottle bundle, and have since purchased additional pieces and sizes even though I rarely use the bottle anymore. I’ve used them for powders, nuts, grapes, supplements, and all sorts of other things. They’re great for everyday use, the gym, work, and traveling. I highly recommend this size bundle as well as the smaller ones that are available!

Love WhiskWare and ProStak products. Perfect for packing snacks in my car or messenger bag. Added the 2 pack to my supply because it was pictured with a pill tray. Product arrived without the tray. Too much of a hassle to return.

The 250 ml size is the PERFECT size for TWO scoops of whey protein. I used to put one scoop into two separate 150 ml size ones. That worked fine. But then I accidentally left them at the gym. Obviously gym bros took that instantly. Bought these as a replacement hoping two scoops would fit into one and it does. Pro Stak system is great. I had the other ones for probably a decade and never had an issue with them. They’re still made exactly the same.

Used these to store my protein and preworkout when I went to the gym until I lost them. Never had any issues. Dropped them multiple times and they never spilled open or cracked and they never got stuck together. Worked largely as expected.

Great product! They have worked well so far. No leaks or issues.

Buen material, buena función, nunca fallan.

Love how they fit together, ideal portion size and handy for work, highly recomend

Great addition to the shaker, I use mine to carry my supplements for the day and split them off into different times

Perfect for those bigger protien measurements, This storage unit is just what I needed, It can handle my weekend dosage and the pill tray insert allows for my creatine too. It is a simple storage device and the interlock compatibility allows ease of storage and portability all in one. When I used the according bottle it was so simple to train with these containers as they snap together easily.

Great product. The bottom container holds two full scoops of protein providing 60g of post-workout glory. The middle and top containers are great for BCAAs and pre-workout alike. In the top container, theres a small pill storage unit which is super convenient if you've got any of your products in pill form. The units stack together well, and the lids remain tight. With multiple units, you can recombine some to make a smaller container. It's a great product, and made with the durability you come to expect from BlenderBottle.