Peak Design makes the most thoughtfully engineered packing cube in this roundup, and charges accordingly. Its trick is doing two jobs in one cube: a dual-compartment design that keeps clean and dirty clothes apart, and a built-in compression zipper that cinches the whole thing down. If you value that, it's excellent. If you just want your suitcase in labeled boxes, you're paying for engineering you won't use.
The dual-compartment trick
Most people solve clean-versus-dirty with a second cube or a separate laundry bag. Peak Design builds the split into a single cube: two compartments, so worn clothes go in one side and fresh in the other, in the same footprint. Combined with the built-in compression zipper — which squeezes soft clothes down without a separate compression cube — it's the most space-efficient single cube here. That compression is why it scores an 8 where the Eagle Creek sets score 5: those are regular cubes, this one compresses on its own.
The catch: it's sold one cube at a time
Where Bagail and Amazon Basics sell you four to eight pieces in a set, Peak Design sells individual cubes. Building a three-cube kit means buying three cubes at a premium each, which is why the value score sits at 5 despite the quality. If you're a one-bag traveler who wants one excellent cube, that's fine. If you want a full set on a budget, look at the sets in our roundup instead.
Small vs Medium
The Medium is the versatile default — big enough for tops or bottoms on most trips. The Small suits carry-on minimalists and shorter trips, or as a second cube for smaller items. Both share the identical design; pick by the size of your bag and trip. If compression is your main goal, also weigh a dedicated compression set, which gets you multiple compressing cubes for less than two Peak Design cubes.
Two pages that put this price in context
The honest question about Peak Design is what the money buys against the obvious alternative, and Peak Design vs Thule answers it: single cubes with a divider against a compression set, which is a different problem rather than a cheaper answer. The dual-compartment interior is the feature that most often justifies the spend, and how to pack underwear and socks is the category where it does the most work, because that is where clean and worn become indistinguishable fastest.
