The Case XX 031 Slimline Trapper is a single-blade folding pocket knife with a yellow synthetic handle and chrome-vanadium 31048 CV pattern, measuring 4 1/8 inches closed. The Slimline Trapper is the thinner one-blade version of the Trapper — same length but flatter in the pocket.
Use the 031 as a daily-carry pocket knife when you want a single CV-steel clip blade rather than a stainless slipjoint pair. CV steel takes a sharper edge than stainless and develops a working patina over time. The yellow handle is the brand’s classic high-visibility farmer color.
Case Cutlery has been making pocket knives in Bradford, Pennsylvania since 1889 — the longest-running American cutlery brand still in operation, made in the USA per the manufacturer’s Amazon listing.
