Angular ng-container equivalent in vue.js

You could use conditional grouping on a template as mentioned in the docs here. The template will serve as an invisible wrapper.

<div class="flex-div">
<template v-if="true">
   <img src="cool-img" alt="awesome">
   <h1>Cool Title</h1>
   <p>Cool Text</p>
</template>
<template v-if="false">
   <img src="not-so-cool-img" alt="awesome">
   <h1>Not So Cool Title</h1>
   <p>Not So Cool Text</p>
</template>
</div>