diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4745aaa..501d431 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ### Enhancements
 - **Folder Changes**
   - Folders are now sorted alphabetically in each category
+  - All files in a folder can be downloaded as a single zip file
 - **Document Changes**
   - Reduced size of folder names in documents sidebar
   - Admins can now set keywords for documents to improve search results for
diff --git a/Gemfile b/Gemfile
index a087657..30dc6d9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -23,6 +23,7 @@ gem "kaminari",                "~> 1.1.1"
 gem "mini_magick",             "~> 4.9.2"
 gem "pg_search",               "~> 2.3.0"
 gem "redcarpet",               "~> 3.5.0"
+gem "rubyzip",                 "~> 1.2.3"
 
 # Rails defaults
 gem "coffee-rails",            "~> 5.0"
diff --git a/app/controllers/folders_controller.rb b/app/controllers/folders_controller.rb
index 54fa32f..d38c4cc 100644
--- a/app/controllers/folders_controller.rb
+++ b/app/controllers/folders_controller.rb
@@ -9,7 +9,7 @@ class FoldersController < ApplicationController
   ]
   before_action :create_category, only: [:create, :update]
   before_action :find_category_and_folder_or_redirect, only: [
-    :show, :edit, :upload
+    :show, :edit, :upload, :download_zip
   ]
   before_action :find_folder_or_redirect, only: [
     :update, :destroy, :attach_file, :attach_files
@@ -27,6 +27,18 @@ def show
     @documents = docs_scope_order(@folder.documents).page(params[:page]).per(Folder::DOCS_PER_PAGE)
   end
 
+  # GET /docs/:category/:folder/download-zip
+  def download_zip
+    @folder.generate_zipped_folder!
+    filename = "lofthf-study-#{@folder.category.slug}-#{@folder.slug}.zip"
+
+    if Rails.env.production?
+      redirect_to @folder.zipped_folder.url(query: { "response-content-disposition" => "attachment" }), allow_other_host: true
+    else
+      send_file_if_present @folder.zipped_folder, filename: filename
+    end
+  end
+
   # GET /docs/new
   def new
     category = Category.find_by_param(params[:category])
diff --git a/app/models/folder.rb b/app/models/folder.rb
index 7a6d8e9..58e0391 100644
--- a/app/models/folder.rb
+++ b/app/models/folder.rb
@@ -2,6 +2,9 @@
 
 # Tracks files uploaded to the folder.
 class Folder < ApplicationRecord
+  # Uploaders
+  mount_uploader :zipped_folder, ZipUploader
+
   # Constants
   DOCS_PER_PAGE = 20
 
@@ -32,4 +35,31 @@ def attach_file!(file)
       content_type: Document.content_type(file.original_filename)
     )
   end
+
+  def generate_zipped_folder!
+    zip_name = "folder.zip"
+    temp_zip_file = Tempfile.new(zip_name)
+    begin
+      # Initialize temp zip file.
+      Zip::OutputStream.open(temp_zip_file) { |zos| }
+      # Write to temp zip file.
+      Zip::File.open(temp_zip_file, Zip::File::CREATE) do |zip|
+        documents.each do |document|
+          # Two arguments:
+          # - The name of the file as it will appear in the archive
+          # - The original file, including the path to find it
+          zip.add(document.filename, document.file.path) if File.exist?(document.file.path) && File.size(document.file.path).positive?
+        end
+      end
+      temp_zip_file.define_singleton_method(:original_filename) do
+        zip_name
+      end
+      update zipped_folder: temp_zip_file
+      # update file_size: zipped_folder.size # Cache after attaching to model.
+    ensure
+      # Close and delete the temp file
+      temp_zip_file.close
+      temp_zip_file.unlink
+    end
+  end
 end
diff --git a/app/uploaders/zip_uploader.rb b/app/uploaders/zip_uploader.rb
new file mode 100644
index 0000000..915f464
--- /dev/null
+++ b/app/uploaders/zip_uploader.rb
@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+# Allows a zip file to be uploaded.
+class ZipUploader < CarrierWave::Uploader::Base
+  # Choose what kind of storage to use for this uploader:
+  storage Rails.env.production? ? :fog : :file
+
+  # Override the directory where uploaded files will be stored.
+  # This is a sensible default for uploaders that are meant to be mounted:
+  def store_dir
+    File.join(model.class.to_s.underscore.pluralize, model.id.to_s, mounted_as.to_s)
+  end
+
+  # Provide a default URL as a default if there hasn't been a file uploaded:
+  # def default_url
+  #   "/assets/fallback/" + [version_name, "default.png"].compact.join('_')
+  # end
+
+  # Add a white list of extensions which are allowed to be uploaded.
+  def extension_whitelist
+    %w(zip)
+  end
+
+  # Override the filename of the uploaded files:
+  # Avoid using model.id or version_name here, see uploader/store.rb for details.
+  # def filename
+  #   "something.jpg" if original_filename
+  # end
+end
diff --git a/app/views/folders/show.html.haml b/app/views/folders/show.html.haml
index 733589a..1b71004 100644
--- a/app/views/folders/show.html.haml
+++ b/app/views/folders/show.html.haml
@@ -14,6 +14,10 @@
     %li= link_to "docs", folders_path
     %li.breadcrumb-muted= @category.slug
     %li.breadcrumb-muted= @folder.slug
+    %li.breadcrumb-muted
+      = link_to download_zip_category_folder_path(@folder.category, @folder), method: :post do
+        = icon("fas", "file-download")
+        download all
     - if current_user.editor?
       %li
         = link_to edit_category_folder_path(@category, @folder) do
diff --git a/config/initializers/app_config.rb b/config/initializers/app_config.rb
new file mode 100644
index 0000000..06e5e53
--- /dev/null
+++ b/config/initializers/app_config.rb
@@ -0,0 +1,3 @@
+# frozen_string_literal: true
+
+require "zip"
diff --git a/config/routes.rb b/config/routes.rb
index 53f4a27..b5ba6f4 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -34,6 +34,7 @@
   get "docs/:category/:folder", to: "folders#show", as: :category_folder
   get "docs/:category/:folder/edit", to: "folders#edit", as: :edit_category_folder
   get "docs/:category/:folder/upload", to: "folders#upload", as: :upload_category_folder
+  post "docs/:category/:folder/download-zip", to: "folders#download_zip", as: :download_zip_category_folder
   get "docs/:category/:folder/*filename", to: "documents#download", as: :download_document, format: false
   get "docs/:category", to: redirect("docs"), as: :docs_category
 
diff --git a/db/migrate/20190926234257_add_zipped_folder_to_folders.rb b/db/migrate/20190926234257_add_zipped_folder_to_folders.rb
new file mode 100644
index 0000000..284abc2
--- /dev/null
+++ b/db/migrate/20190926234257_add_zipped_folder_to_folders.rb
@@ -0,0 +1,5 @@
+class AddZippedFolderToFolders < ActiveRecord::Migration[6.0]
+  def change
+    add_column :folders, :zipped_folder, :string
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index d994628..662bb4e 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2019_09_04_004415) do
+ActiveRecord::Schema.define(version: 2019_09_26_234257) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -79,6 +79,7 @@
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.integer "documents_count", default: 0, null: false
+    t.string "zipped_folder"
     t.index ["archived"], name: "index_folders_on_archived"
     t.index ["category_id", "name"], name: "index_folders_on_category_id_and_name", unique: true
     t.index ["category_id", "slug"], name: "index_folders_on_category_id_and_slug", unique: true
@@ -141,7 +142,7 @@
     t.string "header_label"
     t.jsonb "header"
     t.datetime "last_cached_at"
-    t.boolean "archived"
+    t.boolean "archived", default: false, null: false
     t.datetime "created_at", precision: 6, null: false
     t.datetime "updated_at", precision: 6, null: false
     t.bigint "project_id"