diff --git a/bar.go b/bar.go
index 46ea5da..a61ddab 100644
--- a/bar.go
+++ b/bar.go
@@ -32,13 +32,13 @@
 	shutdown chan struct{}
 }
 
-type filler interface {
+type Filler interface {
 	fill(w io.Writer, width int, s *decor.Statistics)
 }
 
 type (
 	bState struct {
-		filler             filler
+		filler             Filler
 		id                 int
 		width              int
 		alignment          int
@@ -75,12 +75,20 @@
 	}
 )
 
-func newBar(wg *sync.WaitGroup, id, width int, total int64, cancel <-chan struct{}, options ...BarOption) *Bar {
+func newBar(
+	wg *sync.WaitGroup,
+	filler Filler,
+	id, width int,
+	total int64,
+	cancel <-chan struct{},
+	options ...BarOption,
+) *Bar {
 	if total <= 0 {
 		total = time.Now().Unix()
 	}
 
 	s := &bState{
+		filler:   filler,
 		id:       id,
 		priority: id,
 		width:    width,
diff --git a/progress.go b/progress.go
index 2af6f69..79c0a9b 100644
--- a/progress.go
+++ b/progress.go
@@ -81,39 +81,27 @@
 
 // AddBar creates a new progress bar and adds to the container.
 func (p *Progress) AddBar(total int64, options ...BarOption) *Bar {
-	// make sure filler is initialized first
-	args := []BarOption{
-		func(s *bState) {
-			s.filler = &barFiller{
-				format: defaultBarStyle,
-			}
-		},
-	}
-	args = append(args, options...)
-	return p.add(total, args...)
+	filler := &barFiller{
+		format: defaultBarStyle,
+	}
+	return p.Add(total, filler, options...)
 }
 
 // AddSpinner creates a new spinner bar and adds to the container.
 func (p *Progress) AddSpinner(total int64, alignment SpinnerAlignment, options ...BarOption) *Bar {
-	// make sure filler is initialized first
-	args := []BarOption{
-		func(s *bState) {
-			s.filler = &spinnerFiller{
-				frames:    defaultSpinnerStyle,
-				alignment: alignment,
-			}
-		},
-	}
-	args = append(args, options...)
-	return p.add(total, args...)
-}
-
-func (p *Progress) add(total int64, options ...BarOption) *Bar {
+	filler := &spinnerFiller{
+		frames:    defaultSpinnerStyle,
+		alignment: alignment,
+	}
+	return p.Add(total, filler, options...)
+}
+
+func (p *Progress) Add(total int64, filler Filler, options ...BarOption) *Bar {
 	p.wg.Add(1)
 	result := make(chan *Bar)
 	select {
 	case p.operateState <- func(s *pState) {
-		b := newBar(p.wg, s.idCounter, s.width, total, s.cancel, options...)
+		b := newBar(p.wg, filler, s.idCounter, s.width, total, s.cancel, options...)
 		if b.runningBar != nil {
 			s.waitBars[b.runningBar] = b
 		} else {