The Adventurer is a large Swiss Army Folder, with a sliding lock release button on the handle. I love these, & Sort of have 2(one is hiding somewhere) I Try to rotate keeping one sharpened, while carrying the other. I like them because of the superior Vitorinox fit & finish, & the obvious usefulness of the tools it contains. It is of similar size to the Vitorinox Parachutist which I also own, but I prefer the Adventurers Lock, to the Parachutists Liner Lock. Not a fan of liner locks that can be accidentally released in handling while using. Also the Adventurer & the Parachutist are large enough to use for an effective self defense weapon. I am never without mine, & use it for something, opening letters & other duties, daily. I highly recommend them.