diff --git a/plan/storage/memory/sync.go b/plan/storage/memory/sync.go
new file mode 100644
index 0000000..ca5fce0
--- /dev/null
+++ b/plan/storage/memory/sync.go
@@ -0,0 +1,52 @@
+package memory
+
+import (
+	"sort"
+	"sync"
+
+	"go-mod.ewintr.nl/planner/item"
+)
+
+type Sync struct {
+	items map[string]item.Item
+	mutex sync.RWMutex
+}
+
+func NewSync() *Sync {
+	return &Sync{
+		items: make(map[string]item.Item),
+	}
+}
+
+func (r *Sync) FindAll() ([]item.Item, error) {
+	r.mutex.RLock()
+	defer r.mutex.RUnlock()
+
+	items := make([]item.Item, 0, len(r.items))
+	for _, item := range r.items {
+		items = append(items, item)
+	}
+	sort.Slice(items, func(i, j int) bool {
+		return items[i].ID < items[j].ID
+	})
+
+	return items, nil
+}
+
+func (r *Sync) Store(e item.Item) error {
+	r.mutex.Lock()
+	defer r.mutex.Unlock()
+
+	r.items[e.ID] = e
+
+	return nil
+}
+
+func (r *Sync) DeleteAll() error {
+	r.mutex.Lock()
+	defer r.mutex.Unlock()
+
+	r.items = make(map[string]item.Item)
+
+	return nil
+}
diff --git a/plan/storage/memory/sync_test.go b/plan/storage/memory/sync_test.go
new file mode 100644
index 0000000..fd4312d
--- /dev/null
+++ b/plan/storage/memory/sync_test.go
@@ -0,0 +1,7 @@
+package memory_test
+
+import "testing"
+
+func TestSync(t *testing.T) {
+	t.Parallel()
+}