Adrian Omar Preciado-Giner (Preciado) appeals his sentence of 46 months of imprisonment for conspiring to possess, and possessing with intent to distribute, more than 100 kilograms of marijuana. He argues that the district court erred by declining his request for a minor role adjustment pursuant to U.S.S.G. § 3B1.2(b) because he acted only as a courier for the drugs at issue. Whether a defendant is a minor participant in a drug offense is a factual determination reviewed for clear error. United States v. Villanueva, 408 F.3d 193, 203 (5th Cir. 2005). “A factual finding is not clearly erroneous if it is plausible in light of the record read as a whole.” Id.

An adjustment for a minor role applies to a defendant “who is less culpable than most other participants, but whose role could not be described as minimal.” § 3B1.2, comment, (n.5). To be eligible for a minor role adjustment, a defendant “must have been peripheral to the advancement of the illicit activity.” United States v. Miranda, 248 F.3d 434, 447 (5th Cir. 2001). The burden is on the defendant to establish his entitlement to the reduction by a preponderance of the evidence. Burton v. United States, 237 F.3d 490, 503 (5th Cir. 2000).

A defendant’s role in the offense “turns upon culpability, not courier status.” United States v. Buenrostro, 868 F.2d 135, 138 (5th Cir. 1989). Consequently, drug couriers are not necessarily eligible for a reduction of their offense level under § 3B1.2. United States v. Edwards, 65 F.3d 430, 434 (5th Cir. 1995). To the contrary, couriers are often “an indispensable part of drug dealing networks. Without somebody to take the drugs across the border, the drugs will never reach their *327 illicit market.” Buenrostro, 868 F.2d at 138.

In denying Preciado a minor role adjustment, the district court observed that Preciado was arrested while transporting from Mexico to Memphis, Tennessee, an “exorbitant” amount of marijuana (474.9 kilograms) with a market value of $834,000. The district court did not clearly err in denying Preciado a minor role adjustment. See United States v. Gallegos, 868 F.2d 711, 712-13 (5th Cir. 1989).

AFFIRMED.