diff --git a/core/includes/common.inc b/core/includes/common.inc
index c7e42f7ade..b91793e199 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -12,6 +12,7 @@
 use Drupal\Component\Utility\SortArray;
 use Drupal\Core\Cache\Cache;
 use Drupal\Core\DrupalKernel;
+use Drupal\Core\StringTranslation\ByteSizeMarkup;
 
 /**
  * @defgroup php_wrappers PHP wrapper functions
@@ -141,7 +142,7 @@
  */
 function format_size($size, $langcode = NULL) {
   @trigger_error('format_size() is deprecated in drupal:9.2.0 and is removed from drupal:10.0.0. Use \Drupal::translation()->formatByteSize($size, $langcode) instead. See https://www.drupal.org/node/2999981', E_USER_DEPRECATED);
-  return \Drupal::translation()->formatByteSize($size, $langcode);
+  return new ByteSizeMarkup($size, ['langcode' => $langcode]);
 }
 
 /**
diff --git a/core/lib/Drupal/Core/StringTranslation/StringTranslationTrait.php b/core/lib/Drupal/Core/StringTranslation/StringTranslationTrait.php
index 0c73fc8f8a..61f37190bc 100644
--- a/core/lib/Drupal/Core/StringTranslation/StringTranslationTrait.php
+++ b/core/lib/Drupal/Core/StringTranslation/StringTranslationTrait.php
@@ -89,13 +89,11 @@ protected function formatPlural($count, $singular, $plural, array $args = [], ar
    *   (optional) Language code to translate to a language other than what is
    *   used to display the page.
    *
-   * @return \Drupal\Core\StringTranslation\TranslatableMarkup
+   * @return \Drupal\Core\StringTranslation\ByteSizeMarkup
    *   A translated string representation of the size.
-   *
-   * @see \Drupal\Core\StringTranslation\TranslationInterface::formatByteSize()
    */
-  protected function formatByteSize($size, ?string $langcode = NULL): TranslatableMarkup {
-    return $this->getStringTranslation()->formatByteSize($size, $langcode);
+  protected function formatByteSize($size, ?string $langcode = NULL): ByteSizeMarkup {
+    return new ByteSizeMarkup($size, ['langcode' => $langcode], $this->getStringTranslation());
   }
 
   /**
diff --git a/core/lib/Drupal/Core/StringTranslation/TranslationInterface.php b/core/lib/Drupal/Core/StringTranslation/TranslationInterface.php
index c49b44cd3f..7d9de54339 100644
--- a/core/lib/Drupal/Core/StringTranslation/TranslationInterface.php
+++ b/core/lib/Drupal/Core/StringTranslation/TranslationInterface.php
@@ -125,9 +125,9 @@ public function formatPlural($count, $singular, $plural, array $args = [], array
    *   (optional) Language code to translate to a language other than what is
    *   used to display the page.
    *
-   * @return \Drupal\Core\StringTranslation\TranslatableMarkup
+   * @return \Drupal\Core\StringTranslation\ByteSizeMarkup
    *   A translated string representation of the size.
    */
-  public function formatByteSize($size, ?string $langcode = NULL): TranslatableMarkup;
+  public function formatByteSize($size, ?string $langcode = NULL): ByteSizeMarkup;
 
 }
diff --git a/core/lib/Drupal/Core/StringTranslation/TranslationManager.php b/core/lib/Drupal/Core/StringTranslation/TranslationManager.php
index 1e4f0eb93a..8f1784fe3c 100644
--- a/core/lib/Drupal/Core/StringTranslation/TranslationManager.php
+++ b/core/lib/Drupal/Core/StringTranslation/TranslationManager.php
@@ -157,50 +157,8 @@ public function formatPlural($count, $singular, $plural, array $args = [], array
   /**
    * {@inheritdoc}
    */
-  public function formatByteSize($size, ?string $langcode = NULL): TranslatableMarkup {
-    $options = ['langcode' => $langcode];
-
-    $absolute_size = abs($size);
-    if ($absolute_size < Bytes::KILOBYTE) {
-      return new PluralTranslatableMarkup($size, '1 byte', '@count bytes', [], $options, $this);
-    }
-    // Create a multiplier to preserve the sign of $size.
-    $sign = $absolute_size / $size;
-    foreach (['KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'] as $unit) {
-      $absolute_size /= Bytes::KILOBYTE;
-      $rounded_size = round($absolute_size, 2);
-      if ($rounded_size < Bytes::KILOBYTE) {
-        break;
-      }
-    }
-
-    $args = ['@size' => $rounded_size * $sign];
-    switch ($unit) {
-      case 'KB':
-        return new TranslatableMarkup('@size KB', $args, $options, $this);
-
-      case 'MB':
-        return new TranslatableMarkup('@size MB', $args, $options, $this);
-
-      case 'GB':
-        return new TranslatableMarkup('@size GB', $args, $options, $this);
-
-      case 'TB':
-        return new TranslatableMarkup('@size TB', $args, $options, $this);
-
-      case 'PB':
-        return new TranslatableMarkup('@size PB', $args, $options, $this);
-
-      case 'EB':
-        return new TranslatableMarkup('@size EB', $args, $options, $this);
-
-      case 'ZB':
-        return new TranslatableMarkup('@size ZB', $args, $options, $this);
-
-      case 'YB':
-        return new TranslatableMarkup('@size YB', $args, $options, $this);
-
-    }
+  public function formatByteSize($size, ?string $langcode = NULL): ByteSizeMarkup {
+    return new ByteSizeMarkup($size, ['langcode' => $langcode], $this);
   }
 
   /**
diff --git a/core/lib/Drupal/Core/StringTranslation/ByteSizeMarkup.php b/core/lib/Drupal/Core/StringTranslation/ByteSizeMarkup.php
new file mode 100644
index 0000000000..83d41fc830
--- /dev/null
+++ b/core/lib/Drupal/Core/StringTranslation/ByteSizeMarkup.php
@@ -0,0 +1,125 @@
+<?php
+
+namespace Drupal\Core\StringTranslation;
+
+use Drupal\Component\Utility\Bytes;
+
+/**
+ * A class to hold byte-size translatable markup.
+ */
+class ByteSizeMarkup extends TranslatableMarkup {
+
+  /**
+   * The item size to display.
+   *
+   * @var int|float
+   */
+  protected $size;
+
+  /**
+   * The already translated markup.
+   *
+   * @var \Drupal\Core\StringTranslation\PluralTranslatableMarkup|\Drupal\Core\StringTranslation\TranslatableMarkup|null
+   */
+  protected $markup;
+
+  /**
+   * Constructs a new ByteSizeMarkup object.
+   *
+   * Generates a string representation for the given byte count.
+   *
+   * @param int|float $size
+   *   The item count to display.
+   * @param array $options
+   *   (optional) An associative array of additional options, with the following
+   *   elements:
+   *   - 'langcode' (defaults to the current language): A language code, to
+   *     translate to a language other than what is used to display the page.
+   *   - 'context' (defaults to the empty context): The context the source
+   *     string belongs to.
+   * @param \Drupal\Core\StringTranslation\TranslationInterface $string_translation
+   *   (optional) The string translation service.
+   *
+   * @see \Drupal\Core\StringTranslation\StringTranslationTrait::formatByteSize()
+   */
+  public function __construct($size, array $options = [], TranslationInterface $string_translation = NULL) {
+    $this->size = $size;
+    parent::__construct('', [], $options, $string_translation);
+  }
+
+  /**
+   * Renders the object as a string.
+   *
+   * @return string
+   *   The translated string.
+   */
+  public function render() {
+    if (!isset($this->markup)) {
+      $absolute_size = abs($this->size);
+      if ($absolute_size < Bytes::KILOBYTE) {
+        $this->markup = new PluralTranslatableMarkup($this->size, '1 byte', '@count bytes', [], $this->options, $this->stringTranslation);
+      }
+      else {
+        // Create a multiplier to preserve the sign of $size.
+        $sign = $absolute_size / $this->size;
+        foreach (['KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'] as $unit) {
+          $absolute_size /= Bytes::KILOBYTE;
+          $rounded_size = round($absolute_size, 2);
+          if ($rounded_size < Bytes::KILOBYTE) {
+            break;
+          }
+        }
+
+        $args = ['@size' => $rounded_size * $sign];
+        switch ($unit) {
+          case 'KB':
+            $this->markup = new TranslatableMarkup('@size KB', $args, $this->options, $this->stringTranslation);
+            break;
+
+          case 'MB':
+            $this->markup = new TranslatableMarkup('@size MB', $args, $this->options, $this->stringTranslation);
+            break;
+
+          case 'GB':
+            $this->markup = new TranslatableMarkup('@size GB', $args, $this->options, $this->stringTranslation);
+            break;
+
+          case 'TB':
+            $this->markup = new TranslatableMarkup('@size TB', $args, $this->options, $this->stringTranslation);
+            break;
+
+          case 'PB':
+            $this->markup = new TranslatableMarkup('@size PB', $args, $this->options, $this->stringTranslation);
+            break;
+
+          case 'EB':
+            $this->markup = new TranslatableMarkup('@size EB', $args, $this->options, $this->stringTranslation);
+            break;
+
+          case 'ZB':
+            $this->markup = new TranslatableMarkup('@size ZB', $args, $this->options, $this->stringTranslation);
+            break;
+
+          case 'YB':
+            $this->markup = new TranslatableMarkup('@size YB', $args, $this->options, $this->stringTranslation);
+            break;
+
+        }
+      }
+    }
+    if (!$this->markup) {
+      // Unsupported byte-size.
+      return $this->markup = '';
+    }
+
+    return $this->markup->render();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function __sleep() {
+    return array_merge(parent::__sleep(), ['size']);
+  }
+
+}