How to fill vertical space with flexbox?

.container {
  display: flex;
  background: #ccc;
}

.left {
  flex: 2;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  align-items: stretch;
  height: 100%;
}

.right {
  flex: 1;
  border: 1px solid #000;
}

.item {
  border: 1px solid #000;
  flex: 1 0 100%;
  align-self: stretch;
}

<div class="container">
  <div class="left">
    <div class="item">
      Item 1
    </div>
    <div class="item">
      Item 2
    </div>
  </div>
  <div class="right">
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    sanctus est Lorem ipsum dolor sit amet.
  </div>
</div>