diff --git a/README.md b/README.md
index 08fe64a..f2d32ba 100644
--- a/README.md
+++ b/README.md
@@ -135,8 +135,8 @@ Each pool comes with a set of default options which can be individually overridd
 |:----------------|:----------:|:----------:|:------------|
 | **active**      | `boolean`  | `TRUE`     | Whether to enable or disable the cache service.
 | **prefix**      | `string`   | `charcoal` | Name of the main Stash pool.
-| **types**       | `string[]` | `memory`   | List of cache drivers to choose from for the main Stash pool.
-| **default_ttl** | `integer`  | 1 week     | Default time-to-live (in seconds) for a cached item.  Currently, only used by the APC driver (`cache/drivers.apc`).
+| **types**       | `string[]` | `memory`   | List of cache drivers to choose from for the main Stash pool. Defaults to "memory".
+| **default_ttl** | `integer`  | 1 week     | Default time-to-live (in seconds) for a cached item. Currently, only used by the APC driver (`cache/drivers.apc`).
 
 
 
diff --git a/src/Charcoal/Cache/CacheConfig.php b/src/Charcoal/Cache/CacheConfig.php
index 6316e7a..3d761a9 100644
--- a/src/Charcoal/Cache/CacheConfig.php
+++ b/src/Charcoal/Cache/CacheConfig.php
@@ -14,6 +14,13 @@ class CacheConfig extends AbstractConfig
 {
     const DEFAULT_NAMESPACE = 'charcoal';
 
+    /**
+     * Default cache type and fallback for user preference.
+     */
+    const DEFAULT_TYPES = [
+        'memory' => true
+    ];
+
     /**
      * Human-readable intervals in seconds.
      */
@@ -39,7 +46,7 @@ class CacheConfig extends AbstractConfig
      *
      * @var array
      */
-    private $types = [ 'memory' ];
+    private $types;
 
     /**
      * Time-to-live in seconds.
@@ -64,7 +71,7 @@ public function defaults()
     {
         return [
             'active'      => true,
-            'types'       => [ 'memory' ],
+            'types'       => $this->defaultTypes(),
             'default_ttl' => self::WEEK_IN_SECONDS,
             'prefix'      => self::DEFAULT_NAMESPACE
         ];
@@ -137,18 +144,33 @@ public function addType($type)
             );
         }
 
-        $this->types[] = $type;
+        $this->types[$type] = true;
         return $this;
     }
 
     /**
      * Retrieve the cache type(s) to use.
      *
+     * Note:
+     * 1. The default cache type is always appended.
+     * 2. Duplicate types are removed.
+     *
      * @return array
      */
     public function types()
     {
-        return $this->types;
+        $types = $this->types + self::DEFAULT_TYPES;
+        return array_keys($types);
+    }
+
+    /**
+     * Retrieve the default cache types.
+     *
+     * @return string[]
+     */
+    public function defaultTypes()
+    {
+        return array_keys(self::DEFAULT_TYPES);
     }
 
     /**
diff --git a/src/Charcoal/Cache/ServiceProvider/CacheServiceProvider.php b/src/Charcoal/Cache/ServiceProvider/CacheServiceProvider.php
index 60c8570..0a79065 100644
--- a/src/Charcoal/Cache/ServiceProvider/CacheServiceProvider.php
+++ b/src/Charcoal/Cache/ServiceProvider/CacheServiceProvider.php
@@ -232,7 +232,12 @@ public function registerService(Container $container)
         $container['cache'] = function (Container $container) {
             $cacheBuilder = $container['cache/builder'];
             $cacheConfig  = $container['cache/config'];
-            $cacheDrivers = array_unique($cacheConfig['types'] + [ 'memory' ]);
+
+            if ($cacheConfig['active'] === true) {
+                $cacheDrivers = $cacheConfig['types'];
+            } else {
+                $cacheDrivers = $cacheConfig['default_types'];
+            }
 
             return $cacheBuilder($cacheDrivers);
         };
diff --git a/tests/Charcoal/Cache/CacheConfigTest.php b/tests/Charcoal/Cache/CacheConfigTest.php
index 9627c1f..b43e6d9 100644
--- a/tests/Charcoal/Cache/CacheConfigTest.php
+++ b/tests/Charcoal/Cache/CacheConfigTest.php
@@ -43,6 +43,7 @@ public function configFactory(array $args = [])
      * @covers ::defaults
      * @covers ::active
      * @covers ::types
+     * @covers ::defaultTypes
      * @covers ::defaultTtl
      * @covers ::prefix
      */
@@ -60,6 +61,7 @@ public function testDefaults()
 
         $this->assertArrayHasKey('types', $defaults);
         $this->assertEquals($defaults['types'], $this->cfg->types());
+        $this->assertEquals($defaults['types'], $this->cfg->defaultTypes());
 
         $this->assertArrayHasKey('default_ttl', $defaults);
         $this->assertEquals($defaults['default_ttl'], $this->cfg->defaultTtl());
@@ -94,9 +96,18 @@ public function testReplaceDrivers()
 
         // Mutated State
         $types = $this->cfg->types();
-        $this->assertNotContains('memory', $types);
-        $this->assertContains('memcache', $types);
-        $this->assertContains('noop', $types);
+        $this->assertEquals([ 'memcache', 'noop', 'memory' ], $types);
+    }
+
+    /**
+     * @covers ::types
+     */
+    public function testUniqueDrivers()
+    {
+        $this->cfg->setTypes([ 'memcache', 'memory', 'file', 'memcache' ]);
+
+        $types = $this->cfg->types();
+        $this->assertEquals([ 'memcache', 'memory', 'file' ], $types);
     }
 
     /**
diff --git a/tests/Charcoal/Cache/ServiceProvider/CacheServiceProviderTest.php b/tests/Charcoal/Cache/ServiceProvider/CacheServiceProviderTest.php
index 613bebe..925cab7 100644
--- a/tests/Charcoal/Cache/ServiceProvider/CacheServiceProviderTest.php
+++ b/tests/Charcoal/Cache/ServiceProvider/CacheServiceProviderTest.php
@@ -205,27 +205,18 @@ public function provideConfigsForMainDriver()
         $driverClassNames = DriverList::getAvailableDrivers();
 
         return [
-            'Cache: Disabled' => [
-                $driverClassNames['Ephemeral'],
-                [
-                    'active' => false
-                ]
-            ],
-            'Cache: Default Type' => [
-                $driverClassNames['Ephemeral'],
+            'Cache: Enabled' => [
+                $driverClassNames['BlackHole'],
                 [
+                    'active' => true,
+                    'types'  => [ 'noop' ],
                 ]
             ],
-            'Cache: Fallback Type' => [
+            'Cache: Disabled' => [
                 $driverClassNames['Ephemeral'],
                 [
-                    'types' => []
-                ]
-            ],
-            'Cache: Chosen Type' => [
-                $driverClassNames['BlackHole'],
-                [
-                    'types' => [ 'noop' ]
+                    'active' => false,
+                    'types'  => [ 'noop' ],
                 ]
             ],
         ];