ProStak® Expansion Pak

The twist-lock pill tray on top is a game changer for keeping my vitamins separate from protein powder, and the three extra jars mean I can prep snacks for a whole week. Everything clicks together solidly, no rattling in my gym bag.

The pill tray clicks in so satisfyingly tight, and having three extra jars means I can finally prep a full week of snacks without digging for a fourth container. The threading on the jars matches the base perfectly, no wobble even when the bag gets tossed around.

I was a bit worried the extra jars would make the bottle too tall to fit in my gym bag, but they lock in so securely that it actually feels sturdier. The pill tray twists on and off easily, which is perfect for keeping my supplements separate from my pre-workout.