diff --git a/.env.example b/.env.example
index 388866b..6c10111 100644
--- a/.env.example
+++ b/.env.example
@@ -110,5 +110,8 @@ SUPABASE_SERVICE_KEY=
 # admin upload 토큰 TTL (초). default 1800 = 30분
 UPLOAD_TOKEN_TTL_SEC=1800
 
-# 로컬 개발: ./data/packs / NAS 운영: /volume1/docker/webpage/media/packs
+# 호스트 마운트 경로 (로컬 ./data/packs, NAS /volume1/docker/webpage/media/packs)
 PACK_DATA_PATH=./data/packs
+
+# 컨테이너 내부 PACK_BASE_DIR (routes.py가 파일 저장 시 사용. docker-compose volume의 컨테이너 측 경로와 반드시 일치)
+PACK_BASE_DIR=/app/data/packs
diff --git a/docker-compose.yml b/docker-compose.yml
index 708c2d9..260830d 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -191,8 +191,9 @@ services:
       - SUPABASE_URL=${SUPABASE_URL:-}
       - SUPABASE_SERVICE_KEY=${SUPABASE_SERVICE_KEY:-}
       - UPLOAD_TOKEN_TTL_SEC=${UPLOAD_TOKEN_TTL_SEC:-1800}
+      - PACK_BASE_DIR=${PACK_BASE_DIR:-/app/data/packs}
     volumes:
-      - ${PACK_DATA_PATH:-./data/packs}:/app/data/packs
+      - ${PACK_DATA_PATH:-./data/packs}:${PACK_BASE_DIR:-/app/data/packs}
     healthcheck:
       test: ["CMD", "python", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:8000/health')"]
       interval: 30s
diff --git a/packs-lab/app/routes.py b/packs-lab/app/routes.py
index 65cacbf..dd52bd2 100644
--- a/packs-lab/app/routes.py
+++ b/packs-lab/app/routes.py
@@ -31,7 +31,7 @@ from .models import (
 logger = logging.getLogger("packs-lab.routes")
 router = APIRouter(prefix="/api/packs")
 
-PACK_BASE_DIR = Path("/volume1/docker/webpage/media/packs")
+PACK_BASE_DIR = Path(os.getenv("PACK_BASE_DIR", "/app/data/packs"))
 ALLOWED_EXT = {"pdf", "zip", "mp4", "mov", "mkv", "wav", "m4a", "mp3", "png", "jpg", "jpeg", "webp", "prj"}
 MAX_BYTES = 5 * 1024 * 1024 * 1024  # 5GB
 SAFE_FILENAME = re.compile(r"^[\w가-힣\-\.\(\)\s]+$")