MC Stack 4 - The Original Massive Customs Stackable 4-Pen Fridge Case for Zepbound® & Mounjaro®

Most pen cases make you choose between storing what you have now and planning for what you'll have later. The MC Stack 4 stackable fridge case doesn't make you choose. It's a low-profile, flat-laying case that holds four Zepbound, Mounjaro, or Trulicity single-dose auto-injector pens, and it stacks cleanly on top of other MC Stack 4 cases as your supply grows. One case covers a month, two cover two months, and four cover four. It's slim and discreet with a real fit, as opposed to a tower of cardboard boxes.

The short version

Fits: Zepbound, Mounjaro, and Trulicity single-dose auto-injector pens. Does not fit: KwikPens or Wegovy pens. For those, see the MC Kwik for Zepbound KwikPen, the MC Kwik for Ozempic, or the MC Slim for Wegovy. Stacking: MC Stack 4 cases only stack with other MC Stack 4 cases, not the MC Stack 5.

Why this beats a stack of boxes

• Locks together. Four precision-fit corner posts on top and four matching receptacles on the bottom, so stacked cases stay exactly where you put them. No sliding, no leaning, no reorganizing every time you open the fridge.
• A real fit. Our exclusive 3D-scanned saddle system was built from an actual scan of the pen, so each pen is cradled precisely.
• Low profile. Lies flat on the shelf and takes up only as much height as the pens themselves.
• Sliding lid. Moves smoothly while staying secure.
• Grows with you. Buy what you need now and add more later. Every MC Stack 4 works with every other MC Stack 4.
• Built to last. Rigid plant-based bioplastic. Custom colors available on request.
• Made here. Designed, printed, and shipped from Michigan.

Who it's for

Anyone whose supply changes month to month, from mail-order overstock to switching pharmacies to stocking up ahead of a trip, who wants storage that scales without buying a bigger case every time. This is a fridge storage case. It is not insulated and is not designed for travel. If you need something travel-friendly, check out the MC Cannon or the MC Solo.

Quick answers

Will it fit my pen?

If you use Zepbound, Mounjaro, or Trulicity single-dose auto-injector pens, yes. KwikPens and Wegovy pens need their own cases (linked above). Not sure which pen you have? Shop all cases here, or message us and we'll sort it out before you order.

Can I stack it with my MC Stack 5?

No. MC Stack 4 cases only stack with other MC Stack 4 cases, and MC Stack 5 cases only stack with other MC Stack 5 cases. Pick one size and stick with it.

How do I get more than one?

Just set the quantity at checkout, one case per stack layer. You can also add more later, and they'll stack with the ones you already have.

How do I clean it?

Hand wash with cool water and mild dish soap. It's not dishwasher safe, and it shouldn't be left in a hot car or direct sunlight. Don't force the sliding lid past its natural stopping point.

Storage case only. Medication not included. Always follow your healthcare provider's instructions and the manufacturer's storage guidelines for your medication. Zepbound, Mounjaro, and Trulicity are trademarks of Eli Lilly and Company; Ozempic and Wegovy are trademarks of Novo Nordisk. Massive Customs is not affiliated with or endorsed by these companies.