Zero point three one five inches. That is the total thickness of the Porcupine TiSlim measured through the handle, and it is the number Vosteed built the knife around rather than a by-product of material choices.
The construction: Grade 5 titanium handles, CNC-machined and chamfered to keep the profile slim without going floppy, a large aluminium backspacer to restore rigidity, and a CNC-finished stainless liner integrated into the handle. The blade is a 3.04-inch drop point, and this is where the two SKUs split — the A4820 runs 154CM at $145, the A4815 runs CPM-S90V at $189. That $44 gap buys you one of the highest-vanadium stainless steels in production, with edge retention well beyond what 154CM offers and a corresponding appetite for diamond abrasives when it eventually dulls.
The TiSlim concept has been through the Parallel and the Raccoon before it landed on the Porcupine, which is the most work-oriented shape in the family. A drop point with a generous belly and a precise tip is the shape that handles detail work without giving up slicing, and it is the reason the Porcupine was the most requested candidate for the treatment. The Top Liner Lock keeps the fingers clear during close, which matters more on a thin handle because there is less material between your thumb and the edge.
Thin handles are a compromise, and it is worth being honest about which one. A 0.315-inch handle puts less material between your palm and the blade, so a long cutting session will feel different from a chunky G10 slab — less hot-spotting, less to grip. Vosteed's answer is chamfering plus the aluminium backspacer, and by all accounts the Raccoon TiSlim version of this worked; whether the Porcupine's more pronounced handle shape does the same is a hand-fit question, not a spec-sheet one.
Verdict: buy the $145 154CM version if you want the thin titanium carry and will actually maintain the edge; buy the $189 S90V version if you want to sharpen it twice a year and never think about it again. Either way you are paying for geometry and pocket manners, not for a hard-use knife — this is a slim titanium folder, not a pry tool.
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