Bag Boy Quad Pro vs Sun Mountain PX4

The Quick Verdict

Get the Bag Boy Quad Pro. It lists at $30.05 less than the PX4, weighs 1.2 lbs less, and gives you published folded dimensions — 24 × 17 × 15 inches — so you can actually check whether it fits your trunk before you buy. The PX4's 3-year frame warranty is a real advantage if longevity is what you're shopping for, and it comes with dual umbrella holders where the Quad Pro includes one. But at $299.95 versus $330, the Quad Pro earns the default.

What They Have in Common

Four wheels, two-step folds, a drink holder, an umbrella holder, and an accessory console — both carts cover the standard bases. Each publishes how it holds the bag, they weigh 16 and 17.2 lbs, and neither publishes open dimensions.

Where They Differ

Size and trunk math

This is where the comparison gets lopsided. The Quad Pro folds to 24 × 17 × 15 inches — 3.5 cubic feet — and you can measure your trunk against those numbers before ordering. The PX4's folded size isn't published by Sun Mountain, so there's no number to put a tape measure against. If trunk space is tight, that's not a minor gap. The Quad Pro's 24-inch longest dimension tells you whether it lays flat in your specific car; the PX4 leaves you guessing.

Weight

The Quad Pro comes in at 16 lbs; the PX4 at 17.2. That's 1.2 lbs lighter for the Bag Boy. Neither figure involves a battery — these are push carts. Five pounds is something you feel at the tailgate twice a round; 1.2 lbs is probably not, but it adds to the Quad Pro's overall case.

Bag retention

The Quad Pro uses Bag Boy's Top-Lok system. The PX4 uses adjustable-length bungee cords. Two different approaches, and nothing published ranks one over the other.

Brake and extras

The Quad Pro has a handle-mounted parking brake. Sun Mountain's copy doesn't describe any brake on the PX4. For a cart you'd use on sloped ground, that's worth confirming before you buy. The Quad Pro also includes a magnetic accessory plate and a deep scorecard console. The PX4 counters with extendable front axles, a second umbrella holder, a mesh basket, and a valuables pouch. Different extras on each side; a published brake on the Quad Pro side only.

Warranty

Sun Mountain's 3-year frame warranty is longer than Bag Boy's 2-year limited warranty, but that applies specifically to the frame — other parts get 1 year, which is shorter than Bag Boy's two. If you're thinking about using this thing for a decade, that warranty gap matters. The Quad Pro's is a single 2-year limited warranty.

Who Should Buy Which

Get the Bag Boy Quad Pro if:

• You want to know exactly what you're getting into before it ships — the folded dimensions are published and measurable
• Trunk space is tight and you need to confirm fit ahead of time
• You park on hilly terrain or a sloped lot and want a brake in reach
• You like the Top-Lok bag attachment

Get the Sun Mountain PX4 if:

• You're after a longer frame warranty and plan to use this cart for many seasons
• You walk in the rain and want two umbrella holders without buying one separately
• You prefer adjustable bungee cords for holding the bag
• The $30.05 difference at list doesn't move the needle for you

The Bottom Line

The PX4 has a longer frame warranty, a second umbrella holder, and extendable front axles — none of that is trivial. But Sun Mountain doesn't publish a folded size for it, and there's no brake described in their copy. The Quad Pro gives you dimensions to work with, a handle-mounted brake, and lists at $30.05 less. For most golfers, that combination adds up to the easier choice.

Get the Bag Boy Quad Pro.