Klein Tools MODbox Tall Compartment Box, Full-Width Modular

The Verdict

If you’ve already bought into the MODbox system, you know the drill: stackable, interlocking, and built like a tank. The Tall Compartment Box is the piece that fills the “long stuff” gap in that ecosystem — and it does it well. But it’s not without a few quirks worth knowing before you drop the cash.

What You Actually Get

This is a full-width (roughly 18-inch) modular box that clicks into the MODbox stacking system. The interior is divided into two large compartments running the full length of the unit, each with removable plastic dividers you can reposition or pull out entirely. It’s got a deep bottom section and a slightly shallower top tray under the lid.

The box measures about 18 x 12 x 6 inches externally — compact enough to stack under the rolling MODbox cart but with enough depth to swallow items the smaller units can’t. The carry handle is integrated into the lid and locks flat when not in use, so it doesn’t interfere with stacking. You also get that signature MODbox interlocking cleat system on all four sides, which means it locks securely into place on the cart or atop other boxes.

Real-World Performance

I’ve been using this box for six months on residential and light commercial jobs. The polymer shell is thick — noticeably denser than the cheaper stackable systems from other brands. Dropped it off a ladder onto concrete at about five feet; the box bounced, the contents stayed put, and the latches didn’t pop. That’s the test that matters.

The internal dividers are a genuine win. They click into molded slots and hold position firmly enough that small parts don’t migrate between sections, but they pull straight out when you need the full interior. For drywall anchors, screws, and small fittings, I keep one divider in; for a 24-inch torpedo level and a pry bar, I pull it and get the full-width space.

One thing that surprised me: the height. At 6 inches tall, it’s not a shallow tray — you can stand up shorter tools vertically, which doubles usable space. A Milwaukee 6-in-1 screwdriver stands up with room to spare, and a 12-inch Speed Square lies flat with clearance.

What Buyers Keep Praising

The Amazon reviews (240 ratings, 4.8 stars) consistently highlight two things: build quality and the interlocking mechanism. One verified buyer wrote, “The latches are tight and the box feels like it’ll outlive my grandkids’ grandkids.” Another noted, “Finally, a box that holds my 18-inch level without hanging out the side — the full-width design is exactly what I needed.”

Multiple reviewers also mention that it stacks seamlessly with existing MODbox pieces — no wobble, no gaps. The cleats engage with a satisfying click and release cleanly when you press the side buttons.

Where It Falls Short

Let’s be honest about the downsides. First, this thing weighs about 8 pounds empty. That’s heavy for a box this size, and it adds up fast when you’re carrying a fully loaded stack. If you’re hauling this up three flights of stairs with tools inside, you’ll feel it.

Second, there’s no lock hasp. The latch is secure — it won’t pop open accidentally — but if you work on sites where theft is a concern, you can’t padlock this box. That’s a real omission for a premium-priced product.

Third, no clear lid. You’re opening it to find anything. Minor, but annoying when you have a dozen stacked boxes and need to locate a specific tool.

Who Should Buy This

• Electricians and low-voltage techs who carry long fish tapes, levels, and conduit benders — this is your box.
• MODbox system owners who need to fill out their stack with a deep, full-width unit.
• Plumbers and HVAC pros with oversized wrenches, pipe cutters, and multi-bit drivers that don’t fit standard 12-inch boxes.

Skip it if you’re a homeowner with a basic tool kit — the MODbox system requires the cart or other MODbox units to really shine, and this box alone is overkill for occasional DIY.

FAQ

Q: Does this box fit on the Klein MODbox rolling cart? A: Yes. It uses the same interlocking cleat system and locks securely onto the MODbox cart (sold separately) or stacks on other MODbox units.

Q: Can you remove the dividers completely? A: Yes. All dividers pull straight out without tools, giving you one uninterrupted full-width compartment.

Q: Is this box waterproof? A: Not fully. The lid has a rubber gasket that repels light rain and splashes, but it’s not rated for immersion or heavy downpours. Keep it dry.

The Verdict

Rating: 4.6/5

Buy it if you’re invested in the MODbox system and need a deep, full-width box for long tools, or if you want a single rugged storage unit that can take a beating on real job sites.

Skip it if you need a lockable box, want to see contents at a glance, or aren’t already using the MODbox ecosystem — as a standalone, it’s pricey for what it is.

The Klein Tools MODbox Tall Compartment Box earns its 4.8-star Amazon rating. It’s not perfect — the weight and missing lock are legitimate gripes — but for the working tradesperson, this is the box that finally holds the stuff your other boxes can’t. That alone makes it worth the money.

Where to Buy

👉 Check Price on Amazon →

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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.