Ridgid Pro Gear 2.0 3-Piece Tool Box, Cart & Case Storage System

I got the 3 pieces in store separately last week for $0.94 more but I can get 11% back by rebate.

Two main advantages of the Ridgid set are the detachable wheels/handle and the included wall mounting hooks for the boxes.

These [amazon.com], these [amazon.com], or any other 1/4"-20 x 0.3-0.5" quick release pins should work. Just need to pull out the old screws, tap the existing hole for 1/4"-20, and replace with the QR pins. If you have the budget, I wouldn't discount Packout just because you can't remove the handle.

I have two Ridgid v1 stacks, and one Packout stack. I use one Ridgid stack for hauling around camera/lighting gear for events, and the other two for tools.
My key takeaways:

The Packout feels like it's built better, but all three have held up to a few years of abuse.
Packout has many more options if you're going to expand beyond the initial 3-piece stack. The drawer units are a big plus for the Packout lineup.
The Packout release button on the front vs the Ridgid metal clips on the sides is much easier to use, especially in tight quarters.
The Packout stuff has ~2" less internal storage width than the comparable Ridgid v1 stuff (the crate is ~4" narrower). The Packout wheels on the cart are also inset quite a bit more than the Ridgid. Ridgid offers more internal storage width at the cost of maneuverability.

That said, now that Ridgid has hinged the lid on the rolling cart (v1 wasn't hinged, and just completely detached once you unbuckled it), made the wheels detachable, added wall mount capabilities, and offer a half-width parts organizer [homedepot.com], it would be my recommendation over the Packout (taking the substantial price discrepancy into account) as long as you don't want/need drawers, or other specific Packout modules.

This is comparable to dewalts toughsystem, not packout.
Like toughsystem, more than enough quality and durability for the average homewoner/diyer.
If you aren't making a living with your tools, you don't need packout, but man it's nice if you have the cash.