diff --git a/src/Drivers/SessionDriver.php b/src/Drivers/SessionDriver.php
new file mode 100644
index 0000000..8af5687
--- /dev/null
+++ b/src/Drivers/SessionDriver.php
@@ -0,0 +1,84 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Wearepixel\Cart\Drivers;
+
+use Wearepixel\Cart\Drivers\Contracts\CartDriver;
+
+class SessionDriver implements CartDriver
+{
+    private string $itemsKey;
+
+    private string $conditionsKey;
+
+    public function __construct(
+        private mixed $session,
+        private string $sessionKey,
+    ) {
+        $this->itemsKey = $sessionKey . '_cart_items';
+        $this->conditionsKey = $sessionKey . '_cart_conditions';
+    }
+
+    public function getSessionKey(): string
+    {
+        return $this->sessionKey;
+    }
+
+    public function setSessionKey(string $sessionKey): void
+    {
+        $items = $this->session->get($this->itemsKey);
+        $conditions = $this->session->get($this->conditionsKey);
+
+        $this->session->forget($this->itemsKey);
+        $this->session->forget($this->conditionsKey);
+
+        $this->sessionKey = $sessionKey;
+        $this->itemsKey = $sessionKey . '_cart_items';
+        $this->conditionsKey = $sessionKey . '_cart_conditions';
+
+        $this->session->put($this->itemsKey, $items);
+        $this->session->put($this->conditionsKey, $conditions);
+    }
+
+    public function getDriverName(): string
+    {
+        return 'session';
+    }
+
+    public function getItems(): array
+    {
+        return $this->session->get($this->itemsKey) ?? [];
+    }
+
+    public function putItems(array $items): void
+    {
+        $this->session->put($this->itemsKey, $items);
+    }
+
+    public function getConditions(): array
+    {
+        return $this->session->get($this->conditionsKey) ?? [];
+    }
+
+    public function putConditions(array $conditions): void
+    {
+        $this->session->put($this->conditionsKey, $conditions);
+    }
+
+    public function clearItems(): void
+    {
+        $this->session->forget($this->itemsKey);
+    }
+
+    public function flush(): void
+    {
+        $this->session->forget($this->itemsKey);
+        $this->session->forget($this->conditionsKey);
+    }
+
+    public function getSessionModel(): mixed
+    {
+        return null;
+    }
+}
diff --git a/tests/Unit/Drivers/SessionDriverTest.php b/tests/Unit/Drivers/SessionDriverTest.php
new file mode 100644
index 0000000..c6c3f15
--- /dev/null
+++ b/tests/Unit/Drivers/SessionDriverTest.php
@@ -0,0 +1,73 @@
+<?php
+
+declare(strict_types=1);
+
+use Wearepixel\Cart\Drivers\SessionDriver;
+use Wearepixel\Cart\Tests\Helpers\SessionMock;
+
+describe('SessionDriver', function () {
+    beforeEach(function () {
+        $this->session = new SessionMock;
+        $this->driver = new SessionDriver($this->session, 'test-session');
+    });
+
+    test('returns its session key', function () {
+        expect($this->driver->getSessionKey())->toBe('test-session');
+    });
+
+    test('returns session as driver name', function () {
+        expect($this->driver->getDriverName())->toBe('session');
+    });
+
+    test('starts with empty items', function () {
+        expect($this->driver->getItems())->toBe([]);
+    });
+
+    test('stores and retrieves items', function () {
+        $items = [['id' => 1, 'name' => 'Widget', 'price' => 10.0]];
+        $this->driver->putItems($items);
+        expect($this->driver->getItems())->toBe($items);
+    });
+
+    test('starts with empty conditions', function () {
+        expect($this->driver->getConditions())->toBe([]);
+    });
+
+    test('stores and retrieves conditions', function () {
+        $conditions = [['name' => 'GST', 'type' => 'tax', 'value' => '10%']];
+        $this->driver->putConditions($conditions);
+        expect($this->driver->getConditions())->toBe($conditions);
+    });
+
+    test('clearItems removes items from session', function () {
+        $this->driver->putItems([['id' => 1]]);
+        $this->driver->putConditions([['name' => 'GST']]);
+        $this->driver->clearItems();
+
+        expect($this->driver->getItems())->toBe([]);
+        expect($this->driver->getConditions())->toBe([['name' => 'GST']]);
+    });
+
+    test('flush removes items and conditions from session', function () {
+        $this->driver->putItems([['id' => 1]]);
+        $this->driver->putConditions([['name' => 'GST']]);
+        $this->driver->flush();
+
+        expect($this->driver->getItems())->toBe([]);
+        expect($this->driver->getConditions())->toBe([]);
+    });
+
+    test('setSessionKey migrates data to new key', function () {
+        $this->driver->putItems([['id' => 1]]);
+        $this->driver->putConditions([['name' => 'GST']]);
+        $this->driver->setSessionKey('new-key');
+
+        expect($this->driver->getSessionKey())->toBe('new-key');
+        expect($this->driver->getItems())->toBe([['id' => 1]]);
+        expect($this->driver->getConditions())->toBe([['name' => 'GST']]);
+    });
+
+    test('getSessionModel returns null', function () {
+        expect($this->driver->getSessionModel())->toBeNull();
+    });
+});