diff --git a/src/internal/mgr/group.go b/src/internal/mgr/group.go
index 6b63a3e..d5c36cf 100644
--- a/src/internal/mgr/group.go
+++ b/src/internal/mgr/group.go
@@ -3,6 +3,7 @@ package mgr
 import (
 	"errors"
 	"regexp"
+	"strconv"
 	"strings"
 
 	"vpsmgr/internal/db"
@@ -19,6 +20,15 @@ func UserGroupLabel(name string) string {
 	return name[len(g.Parent)+1:]
 }
 
+// MachineSpecs renders a compact quota tag for the container switcher:
+// "<cpu>c<mem>g<disk>g", e.g. "4c8g40g". CPU reuses FormatCPU (tenths of a
+// core, so 0.5 stays fractional); memory is MiB rendered as GiB with a trimmed
+// decimal (1024 -> "1", 512 -> "0.5"); disk is already GiB.
+func MachineSpecs(cpuTenths, memMB, diskGB int) string {
+	mem := strconv.FormatFloat(float64(memMB)/1024, 'f', -1, 64)
+	return FormatCPU(cpuTenths) + "c" + mem + "g" + strconv.Itoa(diskGB) + "g"
+}
+
 type UserGroup struct {
 	Name   string
 	Parent string
diff --git a/src/internal/mgr/group_test.go b/src/internal/mgr/group_test.go
index 58f4d55..e187937 100644
--- a/src/internal/mgr/group_test.go
+++ b/src/internal/mgr/group_test.go
@@ -42,6 +42,22 @@ func TestUserGroupLabel(t *testing.T) {
 	}
 }
 
+func TestMachineSpecs(t *testing.T) {
+	for _, test := range []struct {
+		cpu, mem, disk int
+		want           string
+	}{
+		{10, 1024, 10, "1c1g10g"},
+		{40, 8192, 40, "4c8g40g"},
+		{5, 512, 10, "0.5c0.5g10g"},
+		{20, 1536, 20, "2c1.5g20g"},
+	} {
+		if got := MachineSpecs(test.cpu, test.mem, test.disk); got != test.want {
+			t.Errorf("MachineSpecs(%d, %d, %d) = %q, want %q", test.cpu, test.mem, test.disk, got, test.want)
+		}
+	}
+}
+
 func TestUserGroupName(t *testing.T) {
 	if got := UserGroupName("alice-1"); got != "alice" {
 		t.Fatalf("UserGroupName(alice-1) = %q, want alice", got)
diff --git a/src/internal/panel/panel.go b/src/internal/panel/panel.go
index 4dbb470..7798946 100644
--- a/src/internal/panel/panel.go
+++ b/src/internal/panel/panel.go
@@ -6,6 +6,7 @@ import (
 	"net"
 	"net/http"
 	"sort"
+	"strconv"
 	"strings"
 	"sync"
 	"time"
@@ -127,10 +128,18 @@ type sshKeyRow struct {
 	Active bool   `json:"active"`
 }
 
+// groupMemberRow is one container in the user's group switcher. Label and Specs
+// are precomputed because the template cannot call mgr helpers or convert MiB.
+type groupMemberRow struct {
+	Name  string // account name, used as the <option> value
+	Label string // "A" for the base account, else the numeric suffix
+	Specs string // compact quota tag, e.g. "4c8g40g"
+}
+
 type pageData struct {
 	Title              string
 	User               *db.User
-	GroupUsers         []*db.User
+	GroupUsers         []groupMemberRow
 	GroupIndex         string
 	GroupCount         int
 	State              string
@@ -307,14 +316,37 @@ func (s *Server) redirectModal(w http.ResponseWriter, r *http.Request, path, msg
 
 func (s *Server) buildData(u *db.User, msg, errMsg string) pageData {
 	groupUsers, _ := s.mgr.UsersInGroup(u.Name)
-	sort.Slice(groupUsers, func(i, j int) bool { return groupUsers[i].Name < groupUsers[j].Name })
+	// Order: base account ("A") first, then children by numeric suffix, so the
+	// switcher reads A, 1, 2, … 10 instead of the lexical A, 1, 10, 2.
+	sort.Slice(groupUsers, func(i, j int) bool {
+		gi, gj := mgr.ParseUserGroup(groupUsers[i].Name), mgr.ParseUserGroup(groupUsers[j].Name)
+		if gi.Child != gj.Child {
+			return !gi.Child
+		}
+		if gi.Child {
+			ni, _ := strconv.Atoi(groupUsers[i].Name[len(gi.Parent)+1:])
+			nj, _ := strconv.Atoi(groupUsers[j].Name[len(gj.Parent)+1:])
+			if ni != nj {
+				return ni < nj
+			}
+		}
+		return groupUsers[i].Name < groupUsers[j].Name
+	})
+	groupRows := make([]groupMemberRow, 0, len(groupUsers))
+	for _, m := range groupUsers {
+		groupRows = append(groupRows, groupMemberRow{
+			Name:  m.Name,
+			Label: mgr.UserGroupLabel(m.Name),
+			Specs: mgr.MachineSpecs(m.CPU, m.MemMB, m.DiskGB),
+		})
+	}
 	groupIndex := mgr.UserGroupLabel(u.Name)
 	d := pageData{
 		Title:             "VPS Manager",
 		User:              u,
-		GroupUsers:        groupUsers,
+		GroupUsers:        groupRows,
 		GroupIndex:        groupIndex,
-		GroupCount:        len(groupUsers),
+		GroupCount:        len(groupRows),
 		ThemeColor:        u.Color,
 		PublicIP:          s.cfg.DisplayIP(),
 		Prefix:            s.prefix(),
diff --git a/src/internal/panel/panel_test.go b/src/internal/panel/panel_test.go
index 347a993..6d79af7 100644
--- a/src/internal/panel/panel_test.go
+++ b/src/internal/panel/panel_test.go
@@ -1192,6 +1192,51 @@ func TestOverviewSnapshotModal(t *testing.T) {
 	}
 }
 
+// TestOverviewGroupSwitcherLabels verifies the multi-container switcher shows
+// "<label>-<cpu>c<mem>g<disk>g" with the group-name prefix omitted and the base
+// account first, and that the sticky-notes title tags the machine only when the
+// group has more than one container.
+func TestOverviewGroupSwitcherLabels(t *testing.T) {
+	srv, d := newTestServer(t)
+	h := srv.Handler()
+	prefix := "/" + testSecret
+	hash, _ := pw.Hash("pw")
+	// alice: 1 core / 1 GiB / 10 GiB; alice-1: 4 cores / 8 GiB / 40 GiB.
+	if _, err := d.CreateUser("alice", hash, "10.42.0.2", 1, 30001, 10000, 10, 1024, 10); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := d.CreateUser("alice-1", hash, "10.42.0.3", 2, 30002, 10100, 40, 8192, 40); err != nil {
+		t.Fatal(err)
+	}
+	cookie := loginAndCookie(t, h, prefix, "alice", "pw")
+	body := doReq(t, h, http.MethodGet, prefix, nil, cookie).Body.String()
+	base, child := "A-1c1g10g", "1-4c8g40g"
+	for _, want := range []string{">" + base + "</option>", ">" + child + "</option>"} {
+		if !strings.Contains(body, want) {
+			t.Errorf("overview switcher missing %q", want)
+		}
+	}
+	if i, j := strings.Index(body, base), strings.Index(body, child); i < 0 || j < 0 || i > j {
+		t.Errorf("switcher order: base should precede child (base at %d, child at %d)", i, j)
+	}
+	if !strings.Contains(body, "Machine A") {
+		t.Error("notes card should tag the current machine on a multi-container group")
+	}
+
+	// A lone container is not a group: no switcher, no machine tag.
+	if _, err := d.CreateUser("bob", hash, "10.42.0.4", 3, 30003, 10200, 10, 1024, 10); err != nil {
+		t.Fatal(err)
+	}
+	cookie = loginAndCookie(t, h, prefix, "bob", "pw")
+	body = doReq(t, h, http.MethodGet, prefix, nil, cookie).Body.String()
+	if strings.Contains(body, "Machine A") {
+		t.Error("single-container user should not show a machine tag")
+	}
+	if strings.Contains(body, "switch-user") {
+		t.Error("single-container user should not render the switcher")
+	}
+}
+
 // TestStatsEndpoint verifies the /stats JSON endpoint: it requires auth,
 // returns per-minute points for the current user, and computes per-minute
 // bandwidth as the delta of the cumulative rx/tx counters between samples.
diff --git a/src/internal/panel/templates/overview.html b/src/internal/panel/templates/overview.html
index 9ae1dda..7bd8e0f 100644
--- a/src/internal/panel/templates/overview.html
+++ b/src/internal/panel/templates/overview.html
@@ -234,7 +234,7 @@ footer a{color:var(--muted);text-decoration:underline}
 </div>
 {{if .Err}}<div class="err">{{.Err}}</div>{{end}}
 {{if gt .GroupCount 1}}
-<div class="groupbanner"><span>⚠ {{if eq .Lang "zh"}}您的用户组内有多台机器，当前机器序号为{{else}}Your user group has multiple containers. Current container number:{{end}} <strong class="container-index">{{.GroupIndex}}</strong>。{{if eq .Lang "zh"}}请确认您操作的机器无误。{{else}}Confirm this is the intended container before operating.{{end}}{{if gt (len .GroupUsers) 1}}<form action="{{.Prefix}}/switch-user" method="post" class="inline group-switch"><select name="name" onchange="this.form.submit()" aria-label="{{if eq .Lang "zh"}}切换机器{{else}}Switch container{{end}}">{{range .GroupUsers}}<option value="{{.Name}}"{{if eq .Name $.User.Name}} selected{{end}}>{{.Name}}</option>{{end}}</select></form>{{end}}</div>
+<div class="groupbanner"><span>⚠ {{if eq .Lang "zh"}}您的用户组内有多台机器，当前机器序号为{{else}}Your user group has multiple containers. Current container number:{{end}} <strong class="container-index">{{.GroupIndex}}</strong>。{{if eq .Lang "zh"}}请确认您操作的机器无误。{{else}}Confirm this is the intended container before operating.{{end}}{{if gt (len .GroupUsers) 1}}<form action="{{.Prefix}}/switch-user" method="post" class="inline group-switch"><select name="name" onchange="this.form.submit()" aria-label="{{if eq .Lang "zh"}}切换机器{{else}}Switch container{{end}}">{{range .GroupUsers}}<option value="{{.Name}}"{{if eq .Name $.User.Name}} selected{{end}}>{{.Label}}-{{.Specs}}</option>{{end}}</select></form>{{end}}</div>
 {{end}}
 {{if .Impersonated}}
 <div class="impbanner">
@@ -319,7 +319,7 @@ footer a{color:var(--muted);text-decoration:underline}
 </div>
 
 <div class="card">
-<h2>{{if eq .Lang "zh"}}便利贴{{else}}Sticky notes{{end}}<span class="muted notes-status" id="notesStatus"></span></h2>
+<h2>{{if eq .Lang "zh"}}便利贴{{else}}Sticky notes{{end}}{{if gt .GroupCount 1}}<span class="muted"> · {{if eq .Lang "zh"}}机器{{else}}Machine{{end}} {{.GroupIndex}}</span>{{end}}<span class="muted notes-status" id="notesStatus"></span></h2>
 
 <div id="notesEnable" class="notes-cover" hidden>
 <button class="btn accent" id="notesEnableBtn">{{if eq .Lang "zh"}}设置密码以启用便利贴{{else}}Set a password to enable notes{{end}}</button>