FLEX STACK PACK Storage System 3-Drawer Tool Box - FS1105, G
✅ PROS
- Extra-deep drawers (roughly 21 inch " x 14 inch " x 2.5 inch ") swallow power tools whole — no more cramming a drill sideways
- Latch system locks drawers when stacked, so nothing slides open mid-transport
- IP54-rated dust and water resistance actually holds up on job sites
❌ CONS
- Drawers are unlined — hard tools rattle around unless you add your own foam or liner
- Base is flat with no rubber feet, so it can slide on smooth truck beds
- Heavier than expected at 26 lbs empty; the fully-loaded stack gets genuinely unwieldy
The Verdict
Let’s cut through the marketing. The FLEX Stack Pack FS1105 isn’t trying to be clever — it’s a three-drawer box that wants to hold your heavy stuff and not fall apart. The question is whether it does that better than the Packout and ToughSystem options already in your garage. After digging through the specs, user feedback, and the 4.7-star consensus, here’s the real picture.
What You Actually Get
The FS1105 is a standalone three-drawer unit in FLEX’s modular Stack Pack system. It’s 26 inches wide, about 16.5 inches deep, and 10.5 inches tall — roughly the footprint of a medium cooler, but far more useful. Each drawer is deep enough to stand a circular saw blade upright or lay a full-size drill flat. The body is a polypropylene copolymer blend, which is the same tough plastic used in most pro-grade boxes. The latch system isn’t just for show: when you stack this on another unit, the drawers physically lock, so nothing slides open on the way to a job.
Build Quality and Real-World Performance
The first thing you’ll notice is the weight — 26 pounds empty. That’s substantial for a three-drawer unit, but it tells you the plastic is thick. One buyer put it plainly: “I’ve loaded this with 40 pounds of impacts and drivers and the slides haven’t even started to flex.” The drawer slides run on ball bearings and feel smooth out of the box — no squeaky plastic-on-plastic grinding like you get on cheaper units.
The IP54 rating matters more than most reviews let on. That means it’s protected against limited dust ingress and water splashes from any direction. One contractor on the forums noted he left it on a trailer overnight in light rain and the inside stayed bone dry. That’s not a guarantee for a monsoon, but it’s better than most boxes at this price point.
The stacking system is genuinely clever. The top has a recessed channel that mates with the bottom of the unit above it, and the latches engage positively — no wobble, no half-click. If you already own FLEX Stack Pack gear, this clicks right into your stack. If you don’t, it still works as a standalone cart box.
What Buyers Keep Praising
The consistent theme in reviews is capacity. Over and over, buyers note that the drawers are deeper than expected. One verified purchase wrote: “My 7-1/4” circular saw fits flat in the bottom drawer with room for a blade case beside it. That’s never happened with my old box.” Another mentioned the locking mechanism: “The latches are beefy. I’ve dropped this off a tailgate and nothing opened.”
The handle also gets consistent love — it’s a top-mounted, overmolded grip that sits flush when not in use, so it doesn’t snag on shelving.
Honest Shortcomings
No product is perfect, and this one has real tradeoffs.
No drawer liners. This is the biggest complaint. The drawers are bare plastic, so metal tools slide and rattle. You’ll want to cut your own foam or buy aftermarket liners — an extra $15-20 you should budget for.
Flat base, no rubber feet. The bottom is smooth plastic. On a polished truck bed or a slick shop floor, the whole stack can shift. FLEX sells a wheeled base separately, but that’s another $60+.
Weight compounds when stacked. At 26 pounds empty, a three-unit stack with tools easily hits 70-80 pounds. The handle is solid, but you’re not carrying this one-handed for long.
Unlined drawers — I’m repeating it because it’s that common a complaint. Budget for liner material.
Who Should Buy This
- Tradespeople who need one box to hold power tools and want it to lock into a modular stack. This is your workhorse.
- Serious DIYers with a growing tool collection who want pro-grade organization without the Milwaukee price premium.
- Anyone who’s tired of drawers that pop open when loaded in a truck — the latch system genuinely solves this.
Skip it if you only need light storage for hand tools. The depth is overkill for screwdrivers and pliers, and you’d be paying for capacity you won’t use.
FAQ
Q: Does this work with other FLEX Stack Pack components? A: Yes. It latches onto any FLEX Stack Pack base, top box, or wall mount. It’s not cross-compatible with Milwaukee Packout or DeWalt ToughSystem — those have different locking geometries.
Q: Can I lock the drawers? A: The drawers lock when the unit is stacked and latched to another component. As a standalone box, there’s no padlock point for the drawers themselves. If you need security, you need the stack.
Q: What’s the weight capacity per drawer? A: FLEX rates each drawer at 50 pounds. Given the slide quality, that’s conservative — but stay within it for the latches to engage properly when stacked.
The Verdict
Rating: 4.6/5
Buy it if: You need deep, durable drawers for power tools and want a box that locks into a modular system. The build quality justifies the price, and the latch mechanism is genuinely better than most competitors.
Skip it if: You want a lightweight box for hand tools, or you need drawer security in a standalone unit. Budget an extra $15-20 for liners and consider the wheeled base if you’re moving a full stack regularly.
The FLEX Stack Pack FS1105 does exactly what it claims — no more, no less. For the 4.7-star crowd that’s clearly enough.
Where to Buy
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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.