CSS only solution to set MULTIPLE “same height” row sections on a responsive grid

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Based on your own answer, where you grouped them by 4, you can do that with CSS Flexbox too.

To make them behave when there is less than 4, it might be possible to accomplish that using the nth-child selector, but it was simpler to use a last* class, so I went for the latter.

One might even be able to do this without the .group_of_4 wrapper, with some clever nth-child rules, but again, went for the simpler since it does not come with any obvious limitations

Fiddle demo

.items {
  display: flex;
  flex-direction: column;
  max-width: 1200px;
}

.items .group_of_4 {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;        /*  updated  */
}

.items .group_of_4 ~ .group_of_4 {
  margin-top: 24px;
}

.items .group_of_4 > div {
  width: calc(25% - 12px);                /*  updated  */
  box-sizing: border-box;
  padding: 12px;
}


.item__heading {
  background-color: #d4d0f5;
  padding: 10px;
  text-align: center;
  border: 1px solid #bbbbbb;
  order: 1;
}

.item__content {
  padding: 10px;
  border-left: 1px solid #bbbbbb;
  border-right: 1px solid #bbbbbb;
  order: 2;
}

.item__features {
  padding: 10px;
  border-left: 1px solid #bbbbbb;
  border-right: 1px solid #bbbbbb;
  background-color: #f7cbb1;
  order: 3;
}

.item__price {
  background-color: #e0f6d9;
  padding: 10px;
  text-align: center;
  border: 1px solid #bbbbbb;
  order: 4;
}

/* one item in a group */
.items .group_of_4 .last1 {
    margin-right: calc(75%  6px);        /*  updated  */
}
/* two items in a group */
.items .group_of_4 .last2 {
    margin-right: calc(50% + 6px);       /*  updated  */
}
/* three items in a group */
.items .group_of_4 .last3 {
    margin-right: calc(25% + 6px);       /*  updated  */
}

@media (max-width: 600px) {
  .items .group_of_4 > div:nth-child(8) ~ .item__heading {
    margin-top: 24px;
    order: 5;
  }
  .items .group_of_4 > div:nth-child(8) ~ .item__content {
    order: 6;
  }
  .items .group_of_4 > div:nth-child(8) ~ .item__features {
    order: 7;
  }
  .items .group_of_4 > div:nth-child(8) ~ .item__price {
    order: 8;
  }
  
  .items .group_of_4 > div {
    width: calc(50% - 12px);             /*  updated  */
  }

  /* one item in a group */
  /* three items in a group */
  .items .group_of_4 .last1,
  .items .group_of_4 .last3 {
    margin-right: 50%;
  }
  /* two items in a group */
  .items .group_of_4 .last2 {
    margin-right: 0%;
  }  
}
<div class="items">

  <div class="group_of_4">
    <div class="item__heading">
      Item 1
    </div>
    <div class="item__content">
      Some content that is not that long
    </div>
    <div class="item__features">
      <ul>
        <li>feature 1</li>
      </ul>
    </div>
    <div class="item__price">
      £99.99
    </div>

    <div class="item__heading">
      Item 2
    </div>
    <div class="item__content">
      Some content that is longer than other items on the same row and sets the height of this section as it spans many more lines than the rest of the other content sections on this row
    </div>
    <div class="item__features">
      <ul>
        <li>feature 1</li>
      </ul>
    </div>
    <div class="item__price">
      £69.99
    </div>

    <div class="item__heading">
      Item 3
    </div>
    <div class="item__content">
      Some content that is not that long
    </div>
    <div class="item__features">
      <ul>
        <li>feature 1</li>
        <li>feature 2</li>
        <li>feature 3</li>
      </ul>
    </div>
    <div class="item__price">
      £69.99
    </div>

    <div class="item__heading">
      Item 4
    </div>
    <div class="item__content">
      Some content that is not that long
    </div>
    <div class="item__features">
      <ul>
        <li>feature 1</li>
      </ul>
    </div>
    <div class="item__price">
      £109.99
    </div>
  </div>
  
  
  <div class="group_of_4">
    <div class="item__heading">
      Item 5
    </div>
    <div class="item__content">
      Some content that is a medium kind of length blah blah
    </div>
    <div class="item__features">
      <ul>
        <li>feature 1</li>
      </ul>
    </div>
    <div class="item__price">
      £29.99
    </div>

    <div class="item__heading last2">
      Item 6
    </div>
    <div class="item__content last2">
      Some content that is not that long
    </div>
    <div class="item__features last2">
      <ul>
        <li>feature 1</li>
      </ul>
    </div>
    <div class="item__price last2">
      £99.99
    </div> 

  </div>
</div>

Here’s a script based solution, for anyone who want that.

What’s missing in it is a resize event handler, that does recalculate max height per row instead.

(function(d) {
  window.addEventListener("load", function() {
    var item = d.querySelector('.items');
    var items = item.querySelectorAll('.item__features');
    var heights = [], i = 0, css;
    for (i = 0; i < items.length; i++) {
      heights.push(parseFloat(window.getComputedStyle(items[i], null).getPropertyValue("height")));
    }
    css = ".item__features { height: " + Math.max.apply(null, heights) + "px; }" ;
    var st = d.createElement('style');
    st.type="text/css";
    if (st.styleSheet) {
      st.styleSheet.cssText = css
    } else {
      st.appendChild(d.createTextNode(css));
    }
    (d.head || d.getElementsByTagName('head')[0]).appendChild(st);
  }, false);
}(document));
.items {
  display: flex;
  flex-wrap: wrap;
  max-width: 1200px;
}

.item {
  display: flex;
  flex-direction: column;
  width: 25%;
  box-sizing: border-box;
  padding: 0 12px;
  margin: 24px -4px 24px 0;
}

@media (max-width: 600px) {
  .item {
    width: 50%;
  }
}

.item__heading {
  background-color: #d4d0f5;
  padding: 10px;
  text-align: center;
  border: 1px solid #bbbbbb;
}

.item__content {
  flex: 1 1 auto;
  padding: 10px;
  border-left: 1px solid #bbbbbb;
  border-right: 1px solid #bbbbbb;
}

.item__features {
  padding: 10px;
  border-top: 1px solid #bbbbbb;
  border-left: 1px solid #bbbbbb;
  border-right: 1px solid #bbbbbb;
  background-color: #f7cbb1;
}

.item__features ul {
  margin: 0px;
}

.item__price {
  background-color: #e0f6d9;
  padding: 10px;
  text-align: center;
  border: 1px solid #bbbbbb;
}
<div class="items">

  <div class="item">
    <div class="item__heading">
      Item 1
    </div>
    <div class="item__content">
      Some content that is not that long
    </div>
    <div class="item__features">
      <ul>
        <li>feature 1</li>
      </ul>
    </div>
    <div class="item__price">
      £99.99
    </div>
  </div>


  <div class="item">
    <div class="item__heading">
      Item 2
    </div>
    <div class="item__content">
      Some content that is longer than other items on the same row and sets the height of this section as it spans many more lines than the rest of the other content sections on this row
    </div>
    <div class="item__features">
      <ul>
        <li>feature 1</li>
      </ul>
    </div>
    <div class="item__price">
      £69.99
    </div>
  </div>

  <div class="item">
    <div class="item__heading">
      Item 3
    </div>
    <div class="item__content">
      Some content that is not that long
    </div>
    <div class="item__features">
      <ul>
        <li>feature 1</li>
        <li>feature 2</li>
        <li>feature 3</li>
      </ul>
    </div>
    <div class="item__price">
      £69.99
    </div>
  </div>

  <div class="item">
    <div class="item__heading">
      Item 4
    </div>
    <div class="item__content">
      Some content that is not that long
    </div>
    <div class="item__features">
      <ul>
        <li>feature 1</li>
      </ul>
    </div>
    <div class="item__price">
      £109.99
    </div>
  </div>

  <div class="item">
    <div class="item__heading">
      Item 5
    </div>
    <div class="item__content">
      Some content that is a medium kind of length blah blah
    </div>
    <div class="item__features">
      <ul>
        <li>feature 1</li>
      </ul>
    </div>
    <div class="item__price">
      £29.99
    </div>
  </div>

  <div class="item">
    <div class="item__heading">
      Item 6
    </div>
    <div class="item__content">
      Some content that is not that long
    </div>
    <div class="item__features">
      <ul>
        <li>feature 1</li>
        <li>feature 2</li>
      </ul>
    </div>
    <div class="item__price">
      £99.99
    </div>
  </div>

</div>

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  2. Flex / Grid layouts not working on button or fieldset elements
  3. Center and bottom-align flex items
  4. Last margin / padding collapsing in flexbox / grid layout
  5. Make grid container fill columns not rows
  6. Equal width flex items even after they wrap
  7. How to center elements on the last row in CSS Grid?
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  9. All widths set to width of widest element
  10. Make flex items overlap
  11. How can I create a row-based masonry layout using CSS?
  12. What are the default values for justify-content & align content?
  13. Center one and right/left align other flexbox element
  14. How do I keep two side-by-side div elements the same height?
  15. How to disable equal height columns in Flexbox?
  16. Remove space (gaps) between multiple lines of flex items when they wrap
  17. Flexbox: 4 items per row
  18. Absolutely positioned flex item is not removed from the normal flow in IE11
  19. Properly sizing and aligning the flex item(s) on the last row
  20. Grid areas not laying out properly in CSS Grid
  21. Flexbox not giving equal width to elements
  22. Why does percentage padding break my flex item?
  23. flex-grow not working in column layout
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  25. How to make a sticky footer using flexbox in IE11?
  26. Height of flex container not working properly in Safari
  27. Items that span all columns/rows using CSS grid layout
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  29. Pin a flex item to the bottom of the container
  30. How to make a fixed column in CSS using CSS Grid Layout?

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