diff --git a/app.py b/app.py
index ce0a9ff..9f032ce 100644
--- a/app.py
+++ b/app.py
@@ -482,7 +482,8 @@ class Handler(BaseHTTPRequestHandler):
         if path == "/api/statue":
             return game.carve_statue(world, player, str(body.get("of")), now)
         if path == "/api/potion":
-            return game.use_potion(player, str(body.get("item")))
+            qty = body.get("qty", 1)
+            return game.use_potion(player, str(body.get("item")), qty if qty == "all" or isinstance(qty, int) else -1)
         if path == "/api/prayers":
             ids = body.get("ids")
             return game.set_prayers(player, ids) if isinstance(ids, list) else "Bad request"
diff --git a/game.py b/game.py
index 0c2ee3d..c95b496 100644
--- a/game.py
+++ b/game.py
@@ -2692,18 +2692,24 @@ def potion_effect(player: dict, skill: str) -> dict:
     return ITEMS[active["item"]]["potion"] if active else {}
 
 
-def use_potion(player: dict, item: str) -> str | None:
-    """Drink a potion from the bank into its skill's slot (topping up the same potion)."""
+def use_potion(player: dict, item: str, qty: int | str = 1) -> str | None:
+    """Drink potions from the bank into their skill's slot (topping up the same potion)."""
     spec = ITEMS.get(item, {}).get("potion")
     if not spec:
         return "That isn't a potion"
-    if player["bank"].get(item, 0) < 1:
+    have = player["bank"].get(item, 0)
+    if have < 1:
         return "You don't have one"
-    bank_take(player, item, 1)
+    qty = have if qty == "all" else qty
+    if not isinstance(qty, int) or qty < 1:
+        return "Bad amount"
+    if have < qty:
+        return "You don't have that many"
+    bank_take(player, item, qty)
     current = player["potions"].get(spec["skill"])
     charges = current["charges"] if current and current["item"] == item else 0
     fresh = round(POTION_CHARGES * (1.25 if player["cls"] == "homesteader" else 1))
-    player["potions"][spec["skill"]] = {"item": item, "charges": charges + fresh}
+    player["potions"][spec["skill"]] = {"item": item, "charges": charges + fresh * qty}
     return None
 
 
@@ -6270,6 +6276,7 @@ ORDER_RECIPES, ORDER_RAW = _order_sources()
 # line here (new / balance / fix), and a new release a new entry on top.
 PATCH_NOTES = [
     {"date": "2026-10-27", "title": "Prayer", "notes": [
+        ("new", "Added \"Drink all\" option to potions in the bank."),
         ("new", "Firekeeping: Tend all fires. Each log goes on the lowest fire with room in your pile."),
         ("new", "Added resource dumps for Leatherworking: Guard Jerkins"),
         ("fix", "+Q button: rounded corners."),
diff --git a/static/app.js b/static/app.js
index 22a192f..adfe9ac 100644
--- a/static/app.js
+++ b/static/app.js
@@ -1903,6 +1903,7 @@ function itemPanel(id) {
     ${it.slot ? equipRow(id, it) : ""}
     ${it.potion ? `<div class="row"><div class="small">${esc(it.potion.text)} for ${C.potion_charges} ${it.potion.skill === "combat" ? "fights" : "actions"}.</div>
       <button class="btn gold" data-potion="${id}">Drink</button>
+      ${have > 1 ? `<button class="btn sm" data-potion="${id}" data-qty="all">Drink all (${fmt(have)})</button>` : ""}
       ${S.me.potions[it.potion.skill] && S.me.potions[it.potion.skill].item !== id ? `<div class="small why">Replaces your ${esc(item(S.me.potions[it.potion.skill].item).name.toLowerCase())} (${S.me.potions[it.potion.skill].charges} uses left)</div>` : ""}</div>` : ""}
     ${it.heal ? `<div class="row"><div class="small muted">Heals ${it.heal} resting between fights.</div>
       ${S.me.food === id ? `<span class="tag good">Your fighting food</span>` : `<button class="btn sm" data-food="${id}">Eat this first</button>`}</div>` : ""}
@@ -2984,7 +2985,7 @@ document.addEventListener("click", (e) => {
   if (d.track) return act("/api/track", { id: d.track });
   if (d.favour) return act("/api/favour", { kind: d.favour });
   if (d.food) return act("/api/food", { item: d.food === "cheapest" ? null : d.food });
-  if (d.potion) return act("/api/potion", { item: d.potion });
+  if (d.potion) return act("/api/potion", { item: d.potion, qty: d.qty === "all" ? "all" : 1 });
   if (d.unpost) {
     if (!confirm("Delete this message?")) return;
     return act("/api/board/delete", { id: Number(d.unpost) });
diff --git a/tests/test_game.py b/tests/test_game.py
index 9915576..4d903ae 100644
--- a/tests/test_game.py
+++ b/tests/test_game.py
@@ -1636,6 +1636,18 @@ class HerbloreTest(unittest.TestCase):
         self.assertEqual(game.ITEMS["mining_potion_6"]["name"], "Mining potion VI")
         self.assertFalse(any("heal" in p[6] or "double" in p[6] for p in game.POTIONS))
 
+    def test_drink_all_potions_stacks_charges(self):
+        p = self.p
+        p["bank"] = {"mining_potion_1": 3, "mining_potion_2": 1}
+        game.use_potion(p, "mining_potion_2")
+        self.assertIsNone(game.use_potion(p, "mining_potion_1", "all"))
+        self.assertEqual(p["potions"]["mining"], {"item": "mining_potion_1", "charges": 3 * game.POTION_CHARGES})
+        self.assertNotIn("mining_potion_1", p["bank"])
+        self.assertEqual(game.use_potion(p, "mining_potion_1", "all"), "You don't have one")
+        p["bank"]["mining_potion_1"] = 2
+        self.assertEqual(game.use_potion(p, "mining_potion_1", 0), "Bad amount")
+        self.assertEqual(game.use_potion(p, "mining_potion_1", 3), "You don't have that many")
+
     def test_skill_potion_speeds_up_and_uses_charges(self):
         world, p = self.world, self.p
         plain = game.action_time(world, p, game.ACTION_BY_ID["cut_logs"])