Bag Boy Slimfold vs Sun Mountain PX4

The Quick Verdict

Get the Bag Boy Slimfold. At $299.95 list — $30.05 less than the PX4 — it's lighter, it publishes folded dimensions so you can actually check it fits your trunk, and everything you need is in the box. The Sun Mountain PX4 is worth a look if a fourth wheel matters to you and you want the longer frame warranty, but the case for it starts with "Sun Mountain doesn't say how small it folds," and that's a hard way to shop.

What They Have in Common

Both are push carts with a two-step fold, a drink holder, a console, and an umbrella holder in the box. Bag retention on each uses a different method — more on that below — but both hold the bag without asking you to buy something extra.

Where They Differ

Size and Weight

The Slimfold's whole identity is in its folded footprint: 32.25 × 8.5 × 13.5 inches, which works out to 2.1 cubic feet. The 8.5-inch depth is the number that matters at the tailgate. The 32.25-inch length is real, and there's no hiding it: it's a long, flat package.

Sun Mountain doesn't say how small the PX4 folds. That's not a knock invented here — it just means you can't measure your trunk and confirm it fits before you buy. If you need to know the number, the PX4 can't give it to you.

The Slimfold weighs 15 lbs. The PX4 weighs 17.2 lbs. That's a 2.2-lb gap — not dramatic on the fairway, but it's what you're lifting in and out of the trunk twice a round.

Wheels

The PX4 runs on four wheels with extendable front axles, and the Slimfold runs on three. Whether that matters depends on your course and your bag. Neither maker publishes whether the front wheel swivels, so that comparison stops there.

Brake

The Slimfold has a handle-mounted parking brake. Sun Mountain's copy doesn't describe a brake on the PX4. That's not the same as saying the PX4 has none — Sun Mountain just doesn't mention one. Worth checking if your course has hills where you'd want to set it down.

What's in the Box

Both carts include a drink holder and some kind of storage console. The Slimfold adds a detachable umbrella holder and a large accessory bag. The PX4 includes dual umbrella holders, a mesh basket, and a valuables pouch — that's more included storage, and dual umbrella mounts is a real differentiator if you and your partner share a cart or you carry a range umbrella alongside your bag umbrella.

Bag Boy uses the Top-Lok system for bag retention; the PX4 uses adjustable bungee cords.

Warranty

The PX4 carries a 3-year warranty on the frame and 1-year on other parts. The Slimfold's is a 2-year limited warranty. If you're hard on gear, the PX4's frame coverage is a year longer and its other-parts coverage a year shorter.

Who Should Buy Which

Get the Bag Boy Slimfold if:

• Trunk space is tight and you need to know the folded dimensions before you buy.
• You like the Top-Lok bag attachment.
• You want to spend $30 less at list and walk away with umbrella holder and accessory bag included.
• You want a parking brake you can confirm on the spec sheet before you buy.

Get the Sun Mountain PX4 if:

• You specifically want four wheels and extendable front axles.
• Dual umbrella holders and the extra mesh storage are worth $30 more to you.
• A 3-year frame warranty is the kind of thing that tips a close call, and this is a close call.
• You can verify the folded size fits your car before buying, by seeing one folded in person.

The Bottom Line

The Slimfold wins this comparison on information alone: it tells you what you need to know, weighs less, and lists for less. The PX4 has real things going for it — four wheels, more included storage, dual umbrella mounts, a longer frame warranty — but it asks you to buy without knowing how it folds. If those features matter enough to you to figure out the trunk question on your own, it's a reasonable spend. Otherwise, save $30 and pack something you measured first.

Get the Bag Boy Slimfold.