Ich habe Container, deren Höhe sich je nach Inhalt dynamisch ändern sollte. Für alle Container in einer bestimmten Zeile sollte der untere Text unabhängig vom Inhalt in jedem Container am unteren Rand fixiert werden.

.flex-list {
  display: flex;
  flex-direction: column;
}
.flex-list .flex-row {
  display: flex;
  margin-bottom: 20px;
}
.flex-list .flex-row .flex-item-wrapper {
  margin-right: 20px;
  width: 100%;
  background-color: yellow;
}
.flex-list .flex-row .flex-item-wrapper:last-child {
  margin-right: 0px;
  background-color: transparent;
}
.flex-list .flex-row .flex-item-wrapper .flex-item {
  width: 100%;
  height: 100%;
}
.flex-item-stats {
  display: flex;
  justify-content: space-between;
  color: grey;
  padding-top: 10px;
}
.flex-item-stats > * {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.caption {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

<div class="profile-content flex-list">
  <div class="flex-row">
    <div class="flex-item-wrapper">
      <div class="flex-item thumbnail clickable" data-href="#">
        <img class="img-circle" src="http://blog.blogcatalog.com/wp-content/uploads/mario-300x300.jpg" style="width:150px">
        <div class="caption">
          <h4>
                <a href="#">Y-find</a>
              </h4>
          <div class="flex-item-stats">
            <small>left</small>
            <small>right</small>
          </div>
        </div>
      </div>
    </div>
    <div class="flex-item-wrapper">
      <div class="flex-item thumbnail clickable" data-href="#">
        <img class="img-circle" src="http://blog.blogcatalog.com/wp-content/uploads/mario-300x300.jpg" style="width:150px">
        <div class="caption">
          <h4>
                <a href="#">Cardguard Namfix</a>
              </h4>
          <div class="flex-item-stats">
            <small>left</small>
            <small>right</small>
          </div>
        </div>
      </div>
    </div>
    <div class="flex-item-wrapper">
      <div class="flex-item thumbnail clickable" data-href="#">
        <img class="img-circle" src="http://blog.blogcatalog.com/wp-content/uploads/mario-300x300.jpg" style="width:150px">
        <div class="caption">
          <h4>
                <a href="#">Voyatouch Voyatouch Voyatouch Voyatouch Voyatouch Voyatouch </a>
              </h4>
          <div class="flex-item-stats">
            <small>left</small>
            <small>right</small>
          </div>
        </div>
      </div>
    </div>
    <div class="flex-item-wrapper">
    </div>
  </div>

</div>

Ich dachte mitdisplay:flex auf.caption zusammen mitspace-between würde arbeiten, um @ zu schiebflex-item-stats nach unten, aber es scheint nichts zu tun.

jsfiddle