diff --git a/.gitignore b/.gitignore
index 9a9dd9ca4..4af928a07 100644
--- a/.gitignore
+++ b/.gitignore
@@ -30,6 +30,7 @@ yarn-debug.log*
 /public/packs
 /public/packs-test
 /node_modules
+vendor/*
 /yarn-error.log
 yarn-debug.log*
 .yarn-integrity
diff --git a/Gemfile b/Gemfile
index d46ee525c..7ffa37c1c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -67,6 +67,7 @@ gem 'turbolinks' # Turbolinks makes following links in your web application fast
 gem 'typhoeus'
 gem 'warden'
 gem 'webpacker'
+gem 'zipline'
 gem 'zxcvbn-ruby', require: 'zxcvbn'
 
 group :test do
diff --git a/Gemfile.lock b/Gemfile.lock
index 76d7ca1fc..b925daa7a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -170,6 +170,7 @@ GEM
     crass (1.0.4)
     css_parser (1.6.0)
       addressable
+    curb (0.9.10)
     daemons (1.3.1)
     database_cleaner (1.7.0)
     datetime_picker_rails (0.0.7)
@@ -674,6 +675,11 @@ GEM
       nokogiri (~> 1.8)
     xray-rails (0.3.1)
       rails (>= 3.1.0)
+    zip_tricks (4.7.4)
+    zipline (1.1.0)
+      curb (>= 0.8.0, < 0.10)
+      rails (>= 3.2.1, < 6.1)
+      zip_tricks (>= 4.2.1, <= 5.0.0)
     zxcvbn-ruby (0.1.2)
 
 PLATFORMS
@@ -779,6 +785,7 @@ DEPENDENCIES
   webmock
   webpacker
   xray-rails
+  zipline
   zxcvbn-ruby
 
 BUNDLED WITH
diff --git a/app/controllers/gestionnaires/dossiers_controller.rb b/app/controllers/gestionnaires/dossiers_controller.rb
index d58fed8fb..adbc9e237 100644
--- a/app/controllers/gestionnaires/dossiers_controller.rb
+++ b/app/controllers/gestionnaires/dossiers_controller.rb
@@ -5,6 +5,9 @@ module Gestionnaires
     include CreateAvisConcern
     include DossierHelper
 
+    include ActionController::Streaming
+    include Zipline
+
     after_action :mark_demande_as_read, only: :show
     after_action :mark_messagerie_as_read, only: [:messagerie, :create_commentaire]
     after_action :mark_avis_as_read, only: [:avis, :create_avis]
@@ -172,6 +175,14 @@ module Gestionnaires
       render layout: "print"
     end
 
+    def telecharger_pjs
+      return head(:forbidden) if !Flipflop.download_as_zip_enabled? || !dossier.attachments_downloadable?
+
+      files = ActiveStorage::DownloadableFile.create_list_from_dossier(dossier)
+
+      zipline(files, "dossier-#{dossier.id}.zip")
+    end
+
     private
 
     def dossier
diff --git a/app/lib/active_storage/downloadable_file.rb b/app/lib/active_storage/downloadable_file.rb
new file mode 100644
index 000000000..3ef733e8d
--- /dev/null
+++ b/app/lib/active_storage/downloadable_file.rb
@@ -0,0 +1,29 @@
+class ActiveStorage::DownloadableFile
+  def initialize(attached)
+    if using_local_backend?
+      @url = 'file://' + ActiveStorage::Blob.service.path_for(attached.key)
+    else
+      @url = attached.service_url
+    end
+  end
+
+  def url
+    @url
+  end
+
+  def self.create_list_from_dossier(dossier)
+    pjs = PiecesJustificativesService.liste_pieces_justificatives(dossier)
+    pjs.map do |pj|
+      [
+        ActiveStorage::DownloadableFile.new(pj.piece_justificative_file),
+        pj.piece_justificative_file.filename.to_s
+      ]
+    end
+  end
+
+  private
+
+  def using_local_backend?
+    [:local, :local_test, :test].include?(Rails.application.config.active_storage.service)
+  end
+end
diff --git a/app/models/dossier.rb b/app/models/dossier.rb
index 81c426824..28682f056 100644
--- a/app/models/dossier.rb
+++ b/app/models/dossier.rb
@@ -466,6 +466,10 @@ class Dossier < ApplicationRecord
     end
   end
 
+  def attachments_downloadable?
+    !PiecesJustificativesService.liste_pieces_justificatives(self).empty? && PiecesJustificativesService.pieces_justificatives_total_size(self) < 50.megabytes
+  end
+
   private
 
   def log_dossier_operation(author, operation, subject = nil)
diff --git a/app/services/pieces_justificatives_service.rb b/app/services/pieces_justificatives_service.rb
index 411e11124..da7d53325 100644
--- a/app/services/pieces_justificatives_service.rb
+++ b/app/services/pieces_justificatives_service.rb
@@ -70,6 +70,17 @@ class PiecesJustificativesService
     end
   end
 
+  def self.liste_pieces_justificatives(dossier)
+    dossier.champs
+      .select { |c| c.type_champ == TypeDeChamp.type_champs.fetch(:piece_justificative) }
+      .filter { |pj| pj.piece_justificative_file.attached? }
+  end
+
+  def self.pieces_justificatives_total_size(dossier)
+    liste_pieces_justificatives(dossier)
+      .sum { |pj| pj.piece_justificative_file.byte_size }
+  end
+
   def self.serialize_types_de_champ_as_type_pj(procedure)
     tdcs = procedure.types_de_champ.select { |type_champ| type_champ.old_pj.present? }
     tdcs.map.with_index do |type_champ, order_place|
diff --git a/app/views/gestionnaires/dossiers/_header.html.haml b/app/views/gestionnaires/dossiers/_header.html.haml
index 186d4c4d6..61afc1361 100644
--- a/app/views/gestionnaires/dossiers/_header.html.haml
+++ b/app/views/gestionnaires/dossiers/_header.html.haml
@@ -18,6 +18,14 @@
               = link_to "Tout le dossier", print_gestionnaire_dossier_path(dossier.procedure, dossier), target: "_blank", rel: "noopener", class: "menu-item menu-link"
             %li
               = link_to "Uniquement cet onglet", "#", onclick: "window.print()", class: "menu-item menu-link"
+        - if Flipflop.download_as_zip_enabled? && dossier.attachments_downloadable?
+          %span.dropdown.print-menu-opener
+            %button.button.dropdown-button.icon-only
+              %span.icon.attachment
+            %ul.print-menu.dropdown-content
+              %li
+                = link_to "Télécharger toutes les pièces jointes", telecharger_pjs_gestionnaire_dossier_path(dossier.procedure, dossier), target: "_blank", rel: "noopener", class: "menu-item menu-link"
+
 
         = render partial: "gestionnaires/procedures/dossier_actions", locals: { procedure: dossier.procedure, dossier: dossier, dossier_is_followed: current_gestionnaire&.follow?(dossier) }
         %span.state-button
diff --git a/config/features.rb b/config/features.rb
index 1f7816d14..d4bb54e21 100644
--- a/config/features.rb
+++ b/config/features.rb
@@ -18,6 +18,8 @@ Flipflop.configure do
 
   feature :procedure_export_v2_enabled
   feature :operation_log_serialize_subject
+  feature :download_as_zip_enabled,
+    default: false
 
   group :development do
     feature :mini_profiler_enabled,
diff --git a/config/routes.rb b/config/routes.rb
index bb9785886..6abccf8e2 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -335,6 +335,7 @@ Rails.application.routes.draw do
             post 'send-to-instructeurs' => 'dossiers#send_to_instructeurs'
             post 'avis' => 'dossiers#create_avis'
             get 'print' => 'dossiers#print'
+            get 'telecharger_pjs' => 'dossiers#telecharger_pjs'
           end
         end
       end
diff --git a/spec/controllers/gestionnaires/dossiers_controller_spec.rb b/spec/controllers/gestionnaires/dossiers_controller_spec.rb
index cbf5b775a..0f327221a 100644
--- a/spec/controllers/gestionnaires/dossiers_controller_spec.rb
+++ b/spec/controllers/gestionnaires/dossiers_controller_spec.rb
@@ -524,4 +524,24 @@ describe Gestionnaires::DossiersController, type: :controller do
     it { expect(champ_repetition.champs.first.value).to eq('text') }
     it { expect(response).to redirect_to(annotations_privees_gestionnaire_dossier_path(dossier.procedure, dossier)) }
   end
+
+  describe "#telecharger_pjs" do
+    subject do
+      get :telecharger_pjs, params: {
+        procedure_id: procedure.id,
+        dossier_id: dossier.id
+      }
+    end
+
+    context 'when zip download is disabled through flipflop' do
+      before do
+        Flipflop::FeatureSet.current.test!.switch!(:download_as_zip_enabled, false)
+      end
+
+      it 'is forbidden' do
+        subject
+        expect(response).to have_http_status(:forbidden)
+      end
+    end
+  end
 end
diff --git a/spec/lib/active_storage/downloadable_file_spec.rb b/spec/lib/active_storage/downloadable_file_spec.rb
new file mode 100644
index 000000000..b802a90c9
--- /dev/null
+++ b/spec/lib/active_storage/downloadable_file_spec.rb
@@ -0,0 +1,26 @@
+describe ActiveStorage::DownloadableFile do
+  let(:tpjs) { [tpj_not_mandatory] }
+  let!(:tpj_not_mandatory) do
+    TypeDePieceJustificative.create(libelle: 'not mandatory', mandatory: false)
+  end
+  let(:procedure) { Procedure.create(types_de_piece_justificative: tpjs) }
+  let(:dossier) { Dossier.create(procedure: procedure) }
+  let(:procedure) { Procedure.create(types_de_piece_justificative: tpjs) }
+  let(:dossier) { Dossier.create(procedure: procedure) }
+  let(:list) { ActiveStorage::DownloadableFile.create_list_from_dossier(dossier) }
+
+  describe 'create_list_from_dossier' do
+    context 'when no piece_justificative is present' do
+      it { expect(list).to match([]) }
+    end
+
+    context 'when there is a piece_justificative' do
+      let (:pj) { create(:champ, :piece_justificative, :with_piece_justificative_file) }
+      before do
+        dossier.champs = [pj]
+      end
+
+      it { expect(list.length).to be 1 }
+    end
+  end
+end
diff --git a/spec/models/dossier_spec.rb b/spec/models/dossier_spec.rb
index d1ac82b16..67ad2a39a 100644
--- a/spec/models/dossier_spec.rb
+++ b/spec/models/dossier_spec.rb
@@ -99,6 +99,14 @@ describe Dossier do
       end
     end
 
+    describe '#types_de_piece_justificative' do
+      subject { dossier.types_de_piece_justificative }
+      it 'returns list of required piece justificative' do
+        expect(subject.size).to eq(2)
+        expect(subject).to include(TypeDePieceJustificative.find(TypeDePieceJustificative.first.id))
+      end
+    end
+
     describe '#retrieve_last_piece_justificative_by_type', vcr: { cassette_name: 'models_dossier_retrieve_last_piece_justificative_by_type' } do
       let(:types_de_pj_dossier) { dossier.procedure.types_de_piece_justificative }
 
@@ -113,6 +121,20 @@ describe Dossier do
       end
     end
 
+    describe '#retrieve_all_piece_justificative_by_type' do
+      let(:types_de_pj_dossier) { dossier.procedure.types_de_piece_justificative }
+
+      subject { dossier.retrieve_all_piece_justificative_by_type types_de_pj_dossier.first }
+
+      before do
+        create :piece_justificative, :rib, dossier: dossier, type_de_piece_justificative: types_de_pj_dossier.first
+      end
+
+      it 'returns a list of the piece justificative' do
+        expect(subject).not_to be_empty
+      end
+    end
+
     describe '#build_default_champs' do
       context 'when dossier is linked to a procedure with type_de_champ_public and private' do
         let(:dossier) { create(:dossier, user: user) }
@@ -1008,4 +1030,32 @@ describe Dossier do
 
     after { Timecop.return }
   end
+
+  describe '#attachments_downloadable?' do
+    let(:dossier) { create(:dossier, user: user) }
+    # subject { dossier.attachments_downloadable? }
+
+    context "no attachments" do
+      it {
+        expect(PiecesJustificativesService).to receive(:liste_pieces_justificatives).and_return([])
+        expect(dossier.attachments_downloadable?).to be false
+      }
+    end
+
+    context "with a small attachment" do
+      it {
+        expect(PiecesJustificativesService).to receive(:liste_pieces_justificatives).and_return([Champ.new])
+        expect(PiecesJustificativesService).to receive(:pieces_justificatives_total_size).and_return(4.megabytes)
+        expect(dossier.attachments_downloadable?).to be true
+      }
+    end
+
+    context "with a too large attachment" do
+      it {
+        expect(PiecesJustificativesService).to receive(:liste_pieces_justificatives).and_return([Champ.new])
+        expect(PiecesJustificativesService).to receive(:pieces_justificatives_total_size).and_return(100.megabytes)
+        expect(dossier.attachments_downloadable?).to be false
+      }
+    end
+  end
 end
diff --git a/spec/services/pieces_justificatives_service_spec.rb b/spec/services/pieces_justificatives_service_spec.rb
index 3d8eb6d09..6988e3007 100644
--- a/spec/services/pieces_justificatives_service_spec.rb
+++ b/spec/services/pieces_justificatives_service_spec.rb
@@ -20,6 +20,9 @@ describe PiecesJustificativesService do
   let(:errors) { PiecesJustificativesService.upload!(dossier, user, hash) }
   let(:tpjs) { [tpj_not_mandatory] }
 
+  let(:attachment_list) { PiecesJustificativesService.liste_pieces_justificatives(dossier) }
+  let(:poids_total) { PiecesJustificativesService.pieces_justificatives_total_size(dossier) }
+
   describe 'self.upload!' do
     context 'when no params are given' do
       it { expect(errors).to eq([]) }
@@ -81,12 +84,30 @@ describe PiecesJustificativesService do
       before :each do
         # we are messing around piece_justificative
         # because directly doubling carrierwave params seems complicated
-
         piece_justificative_double = double(type_de_piece_justificative: tpj_mandatory)
         expect(dossier).to receive(:pieces_justificatives).and_return([piece_justificative_double])
       end
 
-      it { expect(errors).to match([]) }
+      it {
+        expect(errors).to match([])
+      }
+    end
+  end
+
+  describe '#attachment_list' do
+    context 'when no piece_justificative is present' do
+      it { expect(attachment_list).to match([]) }
+      it { expect(poids_total).to be 0 }
+    end
+
+    context 'when there is a piece_justificative' do
+      let (:pj) { create(:champ, :piece_justificative, :with_piece_justificative_file) }
+      before do
+        dossier.champs = [pj]
+      end
+
+      it { expect(attachment_list).not_to be_empty }
+      it { expect(poids_total).to be pj.piece_justificative_file.byte_size }
     end
   end