diff --git a/app/javascript/mastodon/features/navigation_panel/redesign/mobile_nav.module.scss b/app/javascript/mastodon/features/navigation_panel/redesign/mobile_nav.module.scss
index 56ab0470784..a65a7432490 100644
--- a/app/javascript/mastodon/features/navigation_panel/redesign/mobile_nav.module.scss
+++ b/app/javascript/mastodon/features/navigation_panel/redesign/mobile_nav.module.scss
@@ -31,9 +31,7 @@
   box-sizing: border-box;
   display: flex;
   align-items: center;
-  align-self: center;
-  width: 100%;
-  max-width: 400px;
+  align-self: stretch;
   padding: var(--space-2xs);
   background-color: var(--color-bg-primary);
   border-radius: var(--radius-round);
@@ -48,3 +46,35 @@
 .avatar img {
   border-radius: var(--radius-round);
 }
+
+.slideOutWrapper {
+  position: fixed;
+  inset: 0;
+  z-index: 200;
+  pointer-events: none;
+  background: rgb(from var(--color-bg-overlay) r g b/50%);
+  opacity: 0;
+  transition: opacity 250ms ease;
+
+  &[data-is-open='true'] {
+    pointer-events: auto;
+    opacity: 1;
+  }
+}
+
+.slideOut {
+  // We extend the size of the slideOut to go beyond the viewport
+  // so that when it's pulled away from the side it was opened from,
+  // the background underneath the menu isn't revealed
+  --pull-tolerance: 70px;
+
+  position: fixed;
+  inset-block: 0;
+  inset-inline-start: calc(-1 * var(--pull-tolerance));
+  width: var(--navigation-max-width);
+  max-width: calc(100vw - var(--space-3xl));
+  padding-inline-start: var(--pull-tolerance);
+  touch-action: pan-y;
+  background: var(--color-bg-primary);
+  box-shadow: var(--dropdown-shadow);
+}
diff --git a/app/javascript/mastodon/features/navigation_panel/redesign/mobile_nav.tsx b/app/javascript/mastodon/features/navigation_panel/redesign/mobile_nav.tsx
index d841c6e782b..fed7ddf63be 100644
--- a/app/javascript/mastodon/features/navigation_panel/redesign/mobile_nav.tsx
+++ b/app/javascript/mastodon/features/navigation_panel/redesign/mobile_nav.tsx
@@ -1,71 +1,223 @@
+import { useCallback, useEffect, useRef } from 'react';
+
 import { FormattedMessage } from 'react-intl';
 
+import { useLocation } from 'react-router';
+
 import {
   BellIcon,
   ChatCircleIcon,
   HouseIcon,
   MagnifyingGlassIcon,
+  HamburgerIcon,
 } from '@phosphor-icons/react';
+import { animated, useSpring } from '@react-spring/web';
+import { useDrag } from '@use-gesture/react';
 
+import { closeNavigation, openNavigation } from '@/mastodon/actions/navigation';
 import { Avatar } from '@/mastodon/components/avatar';
+import { IconButton } from '@/mastodon/components/button/redesign';
 import { FOCUS_TARGET } from '@/mastodon/components/navigation_focus_target';
 import { ComposeRedesignButton } from '@/mastodon/features/compose/redesign/trigger';
 import { useAccount } from '@/mastodon/hooks/useAccount';
 import { useIdentity } from '@/mastodon/identity_context';
 import { selectUnreadNotificationGroupsCount } from '@/mastodon/selectors/notifications';
-import { useAppSelector } from '@/mastodon/store';
+import { useAppDispatch, useAppSelector } from '@/mastodon/store';
 
+import { RedesignNavigationPanel } from '.';
 import classes from './mobile_nav.module.scss';
 import { MobileNavLink } from './navigation_link';
 
 export const RedesignMobileNavigation: React.FC = () => {
-  const { accountId } = useIdentity();
+  const dispatch = useAppDispatch();
+
+  const { accountId, signedIn } = useIdentity();
   const account = useAccount(accountId);
+
   const notificationsCount = useAppSelector(
     selectUnreadNotificationGroupsCount,
   );
+
+  const handleOpenNavigation = useCallback(() => {
+    dispatch(openNavigation());
+  }, [dispatch]);
+
+  if (!signedIn) {
+    return null;
+  }
+
   return (
-    <nav className={classes.root}>
-      <ul className={classes.list}>
-        <MobileNavLink to='/home' iconComponent={HouseIcon}>
-          <FormattedMessage id='tabs_bar.home' defaultMessage='Home' />
-        </MobileNavLink>
-        <MobileNavLink
-          to={{
-            pathname: '/explore',
-            state: { focusTarget: FOCUS_TARGET.SEARCH },
-          }}
-          iconComponent={MagnifyingGlassIcon}
+    <>
+      <nav className={classes.root}>
+        <ul className={classes.list}>
+          <MobileNavLink to='/home' iconComponent={HouseIcon}>
+            <FormattedMessage id='tabs_bar.home' defaultMessage='Home' />
+          </MobileNavLink>
+          <MobileNavLink
+            to={{
+              pathname: '/explore',
+              state: { focusTarget: FOCUS_TARGET.SEARCH },
+            }}
+            iconComponent={MagnifyingGlassIcon}
+          >
+            <FormattedMessage id='tabs_bar.search' defaultMessage='Search' />
+          </MobileNavLink>
+          <MobileNavLink to='/conversations' iconComponent={ChatCircleIcon}>
+            <FormattedMessage
+              id='tabs_bar.messages'
+              defaultMessage='Messages'
+              description='Message refers to a direct message. For languages where this is confusing, "chat" or "direct message" can be used.'
+            />
+          </MobileNavLink>
+          <MobileNavLink
+            to='/notifications'
+            iconComponent={BellIcon}
+            withDot={notificationsCount > 0}
+          >
+            <FormattedMessage
+              id='tabs_bar.notifications'
+              defaultMessage='Notifications'
+            />
+          </MobileNavLink>
+          <MobileNavLink
+            to={`/@${account?.acct}`}
+            customIcon={
+              <Avatar size={24} account={account} className={classes.avatar} />
+            }
+          >
+            <FormattedMessage id='tabs_bar.profile' defaultMessage='Profile' />
+          </MobileNavLink>
+        </ul>
+        <ComposeRedesignButton inline />
+        <IconButton // Silly placeholder – will be replaced with button in column header
+          icon={HamburgerIcon}
+          variant='solid'
+          onClick={handleOpenNavigation}
         >
-          <FormattedMessage id='tabs_bar.search' defaultMessage='Search' />
-        </MobileNavLink>
-        <MobileNavLink to='/conversations' iconComponent={ChatCircleIcon}>
-          <FormattedMessage
-            id='tabs_bar.messages'
-            defaultMessage='Messages'
-            description='Message refers to a direct message. For languages where this is confusing, "chat" or "direct message" can be used.'
-          />
-        </MobileNavLink>
-        <MobileNavLink
-          to='/notifications'
-          iconComponent={BellIcon}
-          withDot={notificationsCount > 0}
-        >
-          <FormattedMessage
-            id='tabs_bar.notifications'
-            defaultMessage='Notifications'
-          />
-        </MobileNavLink>
-        <MobileNavLink
-          to={`/@${account?.acct}`}
-          customIcon={
-            <Avatar size={24} account={account} className={classes.avatar} />
-          }
-        >
-          <FormattedMessage id='tabs_bar.profile' defaultMessage='Profile' />
-        </MobileNavLink>
-      </ul>
-      <ComposeRedesignButton inline />
-    </nav>
+          Menu
+        </IconButton>
+      </nav>
+      <SlideOutNavigation />
+    </>
+  );
+};
+
+const MENU_WIDTH = 320;
+
+const SlideOutNavigation: React.FC = () => {
+  const dispatch = useAppDispatch();
+  const location = useLocation();
+  const overlayRef = useRef<HTMLDivElement>(null);
+
+  const isOpen = useAppSelector((state) => state.navigation.open);
+
+  useEffect(() => {
+    dispatch(closeNavigation());
+  }, [dispatch, location]);
+
+  useEffect(() => {
+    const handleDocumentClick = (e: MouseEvent) => {
+      if (overlayRef.current && e.target === overlayRef.current) {
+        dispatch(closeNavigation());
+      }
+    };
+
+    const handleDocumentKeyUp = (e: KeyboardEvent) => {
+      if (e.key === 'Escape') {
+        dispatch(closeNavigation());
+      }
+    };
+
+    document.addEventListener('click', handleDocumentClick);
+    document.addEventListener('keyup', handleDocumentKeyUp);
+
+    return () => {
+      document.removeEventListener('click', handleDocumentClick);
+      document.removeEventListener('keyup', handleDocumentKeyUp);
+    };
+  }, [dispatch]);
+
+  const isLtrDir = getComputedStyle(document.body).direction !== 'rtl';
+
+  const OPEN_MENU_OFFSET = isLtrDir ? -MENU_WIDTH : MENU_WIDTH;
+
+  const [{ x }, spring] = useSpring(
+    () => ({
+      x: isOpen ? 0 : OPEN_MENU_OFFSET,
+      onRest: {
+        x({ value }: { value: number }) {
+          if (value === 0) {
+            dispatch(openNavigation());
+          } else if (value === OPEN_MENU_OFFSET) {
+            dispatch(closeNavigation());
+          }
+        },
+      },
+    }),
+    [isOpen],
+  );
+
+  const bind = useDrag(
+    ({
+      last,
+      offset: [xOffset],
+      velocity: [xVelocity],
+      direction: [xDirection],
+      cancel,
+    }) => {
+      const logicalXDirection = isLtrDir ? -xDirection : xDirection;
+      const logicalXOffset = isLtrDir ? -xOffset : xOffset;
+      const hasReachedDragThreshold = logicalXOffset < -70;
+
+      if (hasReachedDragThreshold) {
+        cancel();
+      }
+
+      if (last) {
+        const isAboveOpenThreshold = logicalXOffset > MENU_WIDTH / 2;
+        const isQuickFlick = xVelocity > 0.5 && logicalXDirection > 0;
+
+        if (isAboveOpenThreshold || isQuickFlick) {
+          void spring.start({ x: OPEN_MENU_OFFSET });
+        } else {
+          void spring.start({ x: 0 });
+        }
+      } else {
+        void spring.start({ x: xOffset, immediate: true });
+      }
+    },
+    {
+      from: () => [x.get(), 0],
+      axis: 'x',
+      filterTaps: true,
+      bounds: isLtrDir ? { right: 0 } : { left: 0 },
+      rubberband: true,
+    },
+  );
+
+  const previouslyFocusedElementRef = useRef<HTMLElement>(null);
+
+  useEffect(() => {
+    const overlay = overlayRef.current;
+    if (isOpen && overlay) {
+      const firstLink = overlay.querySelector<HTMLAnchorElement>('a');
+      previouslyFocusedElementRef.current =
+        document.activeElement as HTMLElement;
+      firstLink?.focus();
+    } else {
+      previouslyFocusedElementRef.current?.focus();
+    }
+  }, [isOpen]);
+
+  return (
+    <div
+      className={classes.slideOutWrapper}
+      data-is-open={isOpen}
+      ref={overlayRef}
+    >
+      <animated.div className={classes.slideOut} {...bind()} style={{ x }}>
+        <RedesignNavigationPanel />
+      </animated.div>
+    </div>
   );
 };
diff --git a/app/javascript/mastodon/features/navigation_panel/redesign/navigation_link.module.scss b/app/javascript/mastodon/features/navigation_panel/redesign/navigation_link.module.scss
index 4cff65ccb57..15f65d84bc6 100644
--- a/app/javascript/mastodon/features/navigation_panel/redesign/navigation_link.module.scss
+++ b/app/javascript/mastodon/features/navigation_panel/redesign/navigation_link.module.scss
@@ -1,4 +1,5 @@
 @use '@/styles/mastodon/mixins';
+@use '@/styles/mastodon/variables';
 
 .wrapper {
   padding-bottom: var(--space-3xs);
@@ -33,6 +34,10 @@
     color: var(--color-text-secondary);
   }
 
+  @media (width < variables.$mobile-menu-breakpoint) {
+    min-height: 40px;
+  }
+
   &:hover,
   &:focus-visible,
   &[aria-current='page'] {
diff --git a/app/javascript/mastodon/features/navigation_panel/redesign/styles.module.scss b/app/javascript/mastodon/features/navigation_panel/redesign/styles.module.scss
index 29bac75d290..1159ba26c4c 100644
--- a/app/javascript/mastodon/features/navigation_panel/redesign/styles.module.scss
+++ b/app/javascript/mastodon/features/navigation_panel/redesign/styles.module.scss
@@ -7,6 +7,14 @@
   height: 100%;
   overflow-y: auto;
   scrollbar-width: thin;
+
+  // Approximate height of fixed navigation elements
+  // to ensure focused elements are scrolled into view
+  // as needed.
+  --header-height: 80px;
+  --footer-height: 200px;
+
+  scroll-padding-block: var(--header-height) var(--footer-height);
 }
 
 .list {
diff --git a/app/javascript/mastodon/features/ui/components/columns_area/redesign.tsx b/app/javascript/mastodon/features/ui/components/columns_area/redesign.tsx
index e53485421a5..6bac9746e4a 100644
--- a/app/javascript/mastodon/features/ui/components/columns_area/redesign.tsx
+++ b/app/javascript/mastodon/features/ui/components/columns_area/redesign.tsx
@@ -3,7 +3,6 @@ import { useCallback } from 'react';
 import classNames from 'classnames';
 
 import { ComposeRedesignButton } from '@/mastodon/features/compose/redesign/trigger';
-import { CollapsibleNavigationPanel } from '@/mastodon/features/navigation_panel';
 import { RedesignNavigationPanel } from '@/mastodon/features/navigation_panel/redesign';
 import { RedesignMobileNavigation } from '@/mastodon/features/navigation_panel/redesign/mobile_nav';
 import { useAppSelector } from '@/mastodon/store';
@@ -74,11 +73,6 @@ export const ColumnsAreaRedesign: React.FC<{
           </div>
 
           <div className='columns-area columns-area--mobile'>{children}</div>
-
-          {isMobile && (
-            // Legacy mobile navigation, to be removed
-            <CollapsibleNavigationPanel />
-          )}
         </main>
       </div>
     );