Even Flexbox product grid with left alignment

Question

I'm trying to get a nice Flexbox grid to use with ecommerce products, but can't quite get it to do what I want.

Here is a demo http://jsbin.com/acejes/9/edit

It may not be possible, I just wanted to check if there's anything else I can do.

Here is my aim…

1. Must be a percentage based grid
2. The first and last column flush against the sides of the container
3. The last row "floats" left

My question is kind of similar to How to align left last row/line in multiple line flexbox, but I specifically want to use %s for the "columns" — I think it's neater and it means I know I'm going to have, say 3 columns in a row if I use a % like 32.5%

I'm almost there, but the last line is being thrown out because of the justify-content property. I'd like the last row to be "floated" left:

Code

It's easier to see my code in the jsbin above, but for the sake of preservation, here is a small snapshot:

<div id="flexbox">
    <div class="column">
        <img src="http://placehold.it/350x150" title="" alt="" />
    </div>
    <div class="column">
        <p class="product-title">Decorated Pink High Heels</p>
        <p class="product-price">$25.99</p>
        <p class="product-title">Decorated Pink High Heels</p>
    </div>
</div>

CSS

* {
    box-sizing: border-box;
}

#flexbox {
    display: flex;
    flex-flow: row wrap;
    width: 100%;
    justify-content: space-between;
    border: 3px solid black;
}

#flexbox .column {
    width: 22%;
    margin-bottom: 30px;
    background-color: red;
}

img {
  max-width: 100%;
}

Answer 1

I don't think this exact solution can be achieved with Flexbox, but you can use advanced selectors instead like this http://jsbin.com/acejes/14/edit

<div class="l-col_33--all">
    <div class="l-col l-col_33">
        <div class="l-col l-col_50">
            <img src="http://placehold.it/350x150" title="" alt="" />
        </div>
        <div class="l-col l-col_50">
            <p class="product-title">1st product Decorated Pink High Heels</p>
            <p class="product-price">$25.99</p>
            <p class="product-title">Decorated Pink High Heels</p>
        </div>
    </div>

    <div class="l-col l-col_33">
        <div class="l-col l-col_100">
            <img src="http://placehold.it/350x150" title="" alt="" />
        </div>
        <div class="l-col l-col_100">
            <p class="product-title">2nd product Decorated Pink High Heels</p>
            <p class="product-price">$25.99</p>
        </div>
    </div>


    <div class="l-col l-col_33">
        <div class="l-col l-col_50">
            <img src="http://placehold.it/350x150" title="" alt="" />
        </div>
        <div class="l-col l-col_50">
            <p class="product-title">3rd product Decorated Pink High Heels</p>
            <p class="product-price">$25.99</p>
        </div>
    </div>
</div>


<style>

img {
  max-width: 100%;
}

body {
  border: 1px solid black;
}

p {
  padding-right: 10px;
  padding-left: 10px;
}

/* E.g. Use an "--all" modifier class on a div wrapper to flush columns against their     container */ 

.l-col_33--all .l-col_33 {
  width: 32%;
  margin-bottom: 40px;
  background-color: red;
}

.l-col_33--all .l-col_33:nth-child(1),
.l-col_33--all .l-col_33:nth-child(3n+1) {
  margin-right: 2%;
  border-bottom: 3px solid green;
}
.l-col_33--all .l-col_33:nth-child(3),
.l-col_33--all .l-col_33:nth-child(3n) {
  margin-left: 2%;
    border-bottom: 3px solid blue;
}

/* Clear rows */
.l-col_33--all .l-col_33:nth-child(3n+1) {
    clear: left;
}

.l-col_33--all:after { /* clearfix */
    content: ".";
    display: block;
    clear: both;
    visibility: hidden;
    line-height: 0;
    height: 0;
}

.l-col {
    position: relative;
    float: left;
}

.l-col_33 {
  width: 33%;
}
</style>