Miguel Angel Montalvo-Nunez pleaded guilty to possession with intent to distribute approximately 96.6 kilograms of marijuana and was sentenced to 41 months’ imprisonment and three years’ supervised release. Montalvo-Nunez was among a group of persons carrying bundles of marijuana into the United States from Mexico. He contends that he should have been *780 sentenced on the basis of the marijuana he carried only.

Under U.S.S.G. § 2D1.1(a)(3), the base offense level for a defendant convicted of a drug offense is determined based on the quantity of drugs involved. United States v. Hernandez-Coronado, 39 F.3d 573, 574 (5th Cir. 1994). Under U.S.S.G. § lB1.3(a)(l), “[t]his quantity includes both drugs with which the defendant was directly involved and drugs that can be attributed to the defendant in a conspiracy as part of his relevant conduct.” Id. The district court did not clearly err in finding that Montalvo-Nunez was responsible for the drugs carried by the others because he was engaged with them in a jointly undertaken criminal activity. Hernandez-Coronado, 39 F.3d at 574-75.

Montalvo-Nunez contends that 21 U.S.C. § 841(a) & (b) are unconstitutional in light of Apprendi v. New Jersey, 530 U.S. 466, 120 S.Ct. 2348, 147 L.Ed.2d 435 (2000). He acknowledges that this issue is foreclosed by United States v. Slaughter, 238 F.3d 580, 582 (5th Cir. 2000). He raises the issue to preserve it for possible further review.

AFFIRMED.