Spyderco Bug® G-10 Folding Knife | C133G | 12C27 Sandvik Steel | Keychain Slipjoint

The Experience

Spyderco calls the Bug their smallest fully functional folding knife — and they mean it literally. At 2.94 inches open and 1.63 inches closed, the Bug fits on a keychain, disappears into a coin pocket, and cuts with an authority that genuinely surprises everyone who picks one up for the first time. The G-10 Bug takes the proven Bug platform and upgrades it with a G-10 fiberglass composite handle and 12C27 Sandvik stainless steel blade — a meaningful step up from the original Bug's entry-level steel that brings genuine edge retention and corrosion resistance to the world's smallest Spyderco folder. No lock — the slipjoint mechanism keeps it completely clean, completely legal everywhere a folding knife is permitted, and completely in keeping with the Bug's identity as a keychain instrument rather than a dedicated cutting tool. The Trademark Round Hole opens it one-handed without a nail nick. The full flat ground blade slices with precision far beyond what 1.27 inches of blade length suggests is possible. Available in Red, Blue, and Black G-10 — three expressions of the same exceptional instrument, each carrying the full Bug G-10 specification without modification. This is the Bug for the naturalist, the estate steward, and the field professional who understands that the best knife is the one that's always there — and nothing is more always-there than a Bug on a keychain.

Scientific Engineering

• 12C27 Sandvik Steel — Genuine Field Grade: The G-10 Bug's blade is crafted from 12C27 — a Swedish stainless steel manufactured by Sandvik and widely regarded as one of the best blade steels available at its price point. With a chromium content of 13.5% and a carbon content of 0.60%, 12C27 achieves a meaningful balance of edge retention, corrosion resistance, and ease of sharpening that significantly outperforms the 3Cr13 steel of the original stainless Bug. A genuine upgrade in a genuinely small package.
• Full Flat Ground PlainEdge™ Blade: The 1.27-inch blade is full flat ground — a geometry that produces a thin, consistent taper from spine to edge across the blade's full width, maximizing cutting efficiency and reducing material resistance during slicing tasks.
• Slipjoint Mechanism — Non-Locking: The Bug G-10 uses a slipjoint mechanism — a traditional, non-locking folding knife design that holds the blade open through spring tension rather than a mechanical lock. This makes the Bug G-10 legal in virtually every jurisdiction that permits folding knives and eliminates the mechanical complexity of a locking system in a knife this compact.
• Trademark Round Hole™ One-Handed Opening: Spyderco's signature round hole allows smooth, reliable one-handed deployment without the traditional nail nick — a meaningful usability improvement on a knife this small where a nail nick would be nearly impossible to use effectively.
• G-10 Fiberglass Composite Handle: The handle scales are injection-molded G-10 — a high-pressure fiberglass laminate that provides superior strength, dimensional stability, and grip texture compared to standard FRN. Available in Red, Blue, and Black.
• Keychain/Lanyard Configuration: An integrated lanyard hole at the handle end — large enough to thread with a keychain, chain, or lanyard — allows the Bug to ride permanently on a keychain or around the neck as a functional field instrument that is never not within reach.

Boutique & Conservation Values

• The Knife That's Always There: At 0.4 ounces and keychain-ready, the Bug G-10 is the field instrument that stays on the kit permanently — not the one that gets left behind because it's too large, too heavy, or too single-purpose to justify the carry weight. When nothing else is there, the Bug is.
• Non-Locking Field Legality: The slipjoint mechanism makes the Bug G-10 the most legally unrestricted folding knife in the Midwest Nest collection — appropriate for field environments, travel, and any context where a locking blade would be restricted or inappropriate.
• Three Colors, One Standard: Whether you choose Red, Blue, or Black, the specification is identical — same 12C27 Sandvik steel, same full flat grind, same slipjoint reliability. The color choice is personal. The performance is consistent.
• Country of Origin: China
• Spyderco Warranty: Every Bug® G-10 is backed by Spyderco's manufacturer warranty against defects in materials and workmanship.

Specifications

• Blade Length: 1.27" (32.3mm)
• Cutting Edge: 1.10" (27.9mm)
• Blade Thickness: 0.079" (2mm)
• Blade Steel: 12C27 Sandvik Stainless Steel
• Blade Finish: Satin
• Blade Grind: Full Flat
• Overall Length: 2.94" (74.7mm)
• Closed Length: 1.63" (41.4mm)
• Handle Material: G-10 Fiberglass Composite
• Lock Type: Slipjoint (non-locking)
• Weight: 0.4 oz. (11.3g)
• Carry System: Lanyard hole, clipless
• Available Colors: Red (C133GRDP) / Blue (C133GBLP) / Black (C133GBKP)
• Country of Origin: China
• Shipping Weight: 1 lb. (estimated)
• Warranty: Spyderco Manufacturer Warranty