<div class="btn-group" data-toggle="buttons">
    <label class="btn btn-primary">
      <input type="checkbox"> Option 1
    </label>
    <label class="btn btn-primary">
      <input type="checkbox"> Option 2
    </label>
    <label class="btn btn-primary">
      <input type="checkbox"> Option 3
    </label>
  </div>