diff --git a/config/collections/index.js b/config/collections/index.js
index cbb0a2a..f7fb72f 100644
--- a/config/collections/index.js
+++ b/config/collections/index.js
@@ -1,20 +1,3 @@
-import dayjs from "dayjs";
-
-export const postsByTag = (collection) => {
-  const posts = collection.getFilteredByTag("post");
-
-  const postsByTag = {};
-
-  for (const post of posts) {
-    for (const tag of post.data.tags) {
-      postsByTag[tag] ??= [];
-      postsByTag[tag].push(post);
-    }
-  }
-
-  return postsByTag;
-};
-
 export const collectionByTag = (collection, collectionName) => {
   const items = collection.getFilteredByTag(collectionName);
 
@@ -29,19 +12,3 @@ export const collectionByTag = (collection, collectionName) => {
 
   return itemsByTag;
 };
-
-export const catalogueByType = (collection) => {
-  const allItems = collection.getFilteredByTag("catalogue");
-
-  const catalogueByType = {};
-
-  for (const item of allItems) {
-    const type = item.data.tags[1];
-    if (!type) continue;
-
-    catalogueByType[type] ??= [];
-    catalogueByType[type].push(item);
-  }
-
-  return catalogueByType;
-};
diff --git a/eleventy.config.js b/eleventy.config.js
index 6a9e71b..075aa9e 100644
--- a/eleventy.config.js
+++ b/eleventy.config.js
@@ -1,7 +1,7 @@
 import pluginNoRobots from "eleventy-plugin-no-robots";
 import { eleventyImageTransformPlugin } from "@11ty/eleventy-img";
 
-import { collectionByTag, postsByTag } from "./config/collections/index.js";
+import { collectionByTag } from "./config/collections/index.js";
 
 import filters from "./config/filters/index.js";
 import markdown from "./config/plugins/markdown.js";
@@ -17,7 +17,9 @@ export default function (eleventyConfig) {
   eleventyConfig.addPlugin(pluginNoRobots);
 
   // 	--------------------- Custom Collections -----------------------
-  eleventyConfig.addCollection("postsByTag", postsByTag);
+  eleventyConfig.addCollection("postsByTag", (collection) =>
+    collectionByTag(collection, "post"),
+  );
   eleventyConfig.addCollection("booksByTag", (collection) =>
     collectionByTag(collection, "book"),
   );