diff --git a/deps-lock.json b/deps-lock.json
index 355a25c..d5a1361 100644
--- a/deps-lock.json
+++ b/deps-lock.json
@@ -62,6 +62,11 @@
       "mvn-repo": "https://repo1.maven.org/maven2/",
       "hash": "sha256-EOzku1+YKQENwWVh9C67g7ry9HYFtR+RBbkvPKoIlxU="
     },
+    {
+      "mvn-path": "org/clojure/pom.contrib/1.2.0/pom.contrib-1.2.0.pom",
+      "mvn-repo": "https://repo.maven.apache.org/maven2/",
+      "hash": "sha256-CRbXpBVYuVAKQnyIb6KYJ6zlJZIGvjrTPmTilvwaYRE="
+    },
     {
       "mvn-path": "org/clojure/spec.alpha/0.2.194/spec.alpha-0.2.194.jar",
       "mvn-repo": "https://repo1.maven.org/maven2/",
@@ -81,6 +86,16 @@
       "mvn-path": "org/clojure/spec.alpha/0.3.218/spec.alpha-0.3.218.pom",
       "mvn-repo": "https://repo1.maven.org/maven2/",
       "hash": "sha256-bY3hTDrIdXYMX/kJVi/5hzB3AxxquTnxyxOeFp/pB1g="
+    },
+    {
+      "mvn-path": "org/clojure/tools.cli/1.1.230/tools.cli-1.1.230.jar",
+      "mvn-repo": "https://repo.maven.apache.org/maven2/",
+      "hash": "sha256-kWYwtTmkP/RotN0BbGKFfitMtdpmhvEpdYfN1DyhAs0="
+    },
+    {
+      "mvn-path": "org/clojure/tools.cli/1.1.230/tools.cli-1.1.230.pom",
+      "mvn-repo": "https://repo.maven.apache.org/maven2/",
+      "hash": "sha256-v7Yh5LAaW4vOEWpgcIQNzdWUnomceEaNgRtuiqqf0cc="
     }
   ]
 }
diff --git a/deps.edn b/deps.edn
index 04dc717..c8ee7c5 100644
--- a/deps.edn
+++ b/deps.edn
@@ -1,2 +1,3 @@
-{:deps {org.clojure/clojure {:mvn/version "1.11.1"}}
+{:deps {org.clojure/clojure {:mvn/version "1.11.1"} 
+        org.clojure/tools.cli {:mvn/version "1.1.230"}}
  :paths ["src"]}
diff --git a/flake.nix b/flake.nix
index fcd205b..30bdda1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -22,7 +22,7 @@
             # https://jlesquembre.github.io/clj-nix/options/
             {
               projectSrc = ./.;
-              name = "com.bartlomiejpluta.packer";
+              name = "packer";
               main-ns = "packer.main";
 
               nativeImage.enable = false;
diff --git a/src/packer/core.clj b/src/packer/core.clj
index f5bd800..b03e549 100644
--- a/src/packer/core.clj
+++ b/src/packer/core.clj
@@ -10,7 +10,7 @@
 
 (defn produce-item [item nights i18n]
   (let [qnt (int (Math/ceil ((:quantity item) nights)))]
-  (str "- [ ] " (get i18n (:key item)) (if (> qnt 1) (str " x" qnt) ""))))
+    (str "- [ ] " (get i18n (:key item)) (if (> qnt 1) (str " x" qnt) ""))))
 
 (defn produce-items [items nights i18n]
   (->> items
diff --git a/src/packer/main.clj b/src/packer/main.clj
index 7216e80..4894185 100644
--- a/src/packer/main.clj
+++ b/src/packer/main.clj
@@ -1,17 +1,57 @@
 (ns packer.main 
   (:use packer.model) 
-  (:require [packer.core :as core]
+  (:require [clojure.tools.cli :refer [parse-opts]]
+            [clojure.string :as str]
+            [packer.core :as core]
             [packer.util :as util]) 
+  (:import java.io.File)
   (:gen-class))
 
 
 (defn eval-file [file]
   (map eval (read-string (str \( (slurp file) \)))))
 
+(def cli-options
+  [["-t" "--template FILE" "File to be used as template instead of default ~/.packer.template.clj or the one from PACKER_TEMPLATE_FILE env var"
+    :parse-fn #(File. %)
+    :validate [#(.exists %) "File must exist"]]
+   ["-h" "--help" "Display help"]])
+
 (defn -main [& args]
-  (let [script (last (eval-file (first args)))
-        i18n (:i18n script)
-        nights (util/ask-int (:nights? i18n))
-        store (:store script)
-        profile ((:profile script) nights)]
-  (println (core/produce store profile nights i18n))))
\ No newline at end of file
+  (let [cli (parse-opts args cli-options)
+        env-template (System/getenv "PACKER_TEMPLATE_FILE")
+        env-template-file (when (some? env-template) (File. env-template))        
+        arg-template-file (get-in cli [:options :template])
+        home-template-file (File. (System/getProperty "user.home") ".packer.template.clj")
+        template-file  (->> [arg-template-file env-template-file home-template-file]
+                            (filter some?)
+                            (filter #(.exists %))
+                            first)
+        output-file (first (:arguments cli))]
+  ;(println (core/produce store profile nights i18n))))
+  (cond 
+    (or (empty? args) (get-in cli [:options :help])) (do 
+      (println "Packer is a tool to generate luggage check-lists using custom templates.")
+      (println "Usage: packer [-t FILE] [-h] output")
+      (println "Options:")
+      (println (:summary cli))
+      (System/exit 0))
+
+    (nil? template-file) (do
+      (binding [*out* *err*] (println "Template file must exist either as ~/.packer.template.clj, be provided with PACKER_TEMPLATE_FILE env var or with -t CLI option."))
+      (System/exit 1))
+
+    (nil? output-file) (do
+      (binding [*out* *err*] (println "The output file is required. Please provide it as a positional CLI argument."))
+      (System/exit 1))
+
+    (not (empty? (:errors cli))) (do
+      (binding [*out* *err*] (println (str/join "\n" (:errors cli))))
+      (System/exit 1))
+      
+    :else (let [script (last (eval-file template-file))
+                i18n (:i18n script)
+                nights (util/ask-int (:nights? i18n))
+                store (:store script)
+                profile ((:profile script) nights)]
+        (spit output-file (str (core/produce store profile nights i18n) "\n"))))))
\ No newline at end of file