diff --git a/msgpack_reader.go b/msgpack_reader.go
index 0461c87..74239d0 100644
--- a/msgpack_reader.go
+++ b/msgpack_reader.go
@@ -9,6 +9,10 @@ import (
 	"github.com/vmihailenco/msgpack/v5/msgpcode"
 )
 
+var FieldNotFound = errors.New("field not found")
+
+var NoOpenContainer = errors.New("there is no open container")
+
 type msgpackReader struct {
 	dec   *msgpack.Decoder
 	stack []readContainer
@@ -69,7 +73,7 @@ func (rd *msgpackReader) ReadInt8(v *int8, targetField string) error {
 		rd.curr.values[field] = raw
 	}
 
-	return errors.Errorf("field `%s` not found", targetField)
+	return FieldNotFound
 }
 
 func (rd *msgpackReader) ReadInt16(v *int16, targetField string) error {
@@ -99,7 +103,7 @@ func (rd *msgpackReader) ReadInt16(v *int16, targetField string) error {
 		rd.curr.values[field] = raw
 	}
 
-	return errors.Errorf("field `%s` not found", targetField)
+	return FieldNotFound
 }
 
 func (rd *msgpackReader) ReadInt32(v *int32, targetField string) error {
@@ -129,7 +133,7 @@ func (rd *msgpackReader) ReadInt32(v *int32, targetField string) error {
 		rd.curr.values[field] = raw
 	}
 
-	return errors.Errorf("field `%s` not found", targetField)
+	return FieldNotFound
 }
 
 func (rd *msgpackReader) ReadInt64(v *int64, targetField string) error {
@@ -159,7 +163,7 @@ func (rd *msgpackReader) ReadInt64(v *int64, targetField string) error {
 		rd.curr.values[field] = raw
 	}
 
-	return errors.Errorf("field `%s` not found", targetField)
+	return FieldNotFound
 }
 
 func (rd *msgpackReader) ReadUint8(v *uint8, targetField string) error {
@@ -189,7 +193,7 @@ func (rd *msgpackReader) ReadUint8(v *uint8, targetField string) error {
 		rd.curr.values[field] = raw
 	}
 
-	return errors.Errorf("field `%s` not found", targetField)
+	return FieldNotFound
 }
 
 func (rd *msgpackReader) ReadUint16(v *uint16, targetField string) error {
@@ -219,7 +223,7 @@ func (rd *msgpackReader) ReadUint16(v *uint16, targetField string) error {
 		rd.curr.values[field] = raw
 	}
 
-	return errors.Errorf("field `%s` not found", targetField)
+	return FieldNotFound
 }
 
 func (rd *msgpackReader) ReadUint32(v *uint32, targetField string) error {
@@ -249,7 +253,7 @@ func (rd *msgpackReader) ReadUint32(v *uint32, targetField string) error {
 		rd.curr.values[field] = raw
 	}
 
-	return errors.Errorf("field `%s` not found", targetField)
+	return FieldNotFound
 }
 
 func (rd *msgpackReader) ReadUint64(v *uint64, targetField string) error {
@@ -279,7 +283,7 @@ func (rd *msgpackReader) ReadUint64(v *uint64, targetField string) error {
 		rd.curr.values[field] = raw
 	}
 
-	return errors.Errorf("field `%s` not found", targetField)
+	return FieldNotFound
 }
 
 func (rd *msgpackReader) ReadBool(v *bool, targetField string) error {
@@ -309,7 +313,7 @@ func (rd *msgpackReader) ReadBool(v *bool, targetField string) error {
 		rd.curr.values[field] = raw
 	}
 
-	return errors.Errorf("field `%s` not found", targetField)
+	return FieldNotFound
 }
 
 func (rd *msgpackReader) ReadFloat32(v *float32, targetField string) error {
@@ -339,7 +343,7 @@ func (rd *msgpackReader) ReadFloat32(v *float32, targetField string) error {
 		rd.curr.values[field] = raw
 	}
 
-	return errors.Errorf("field `%s` not found", targetField)
+	return FieldNotFound
 }
 
 func (rd *msgpackReader) ReadFloat64(v *float64, targetField string) error {
@@ -369,7 +373,7 @@ func (rd *msgpackReader) ReadFloat64(v *float64, targetField string) error {
 		rd.curr.values[field] = raw
 	}
 
-	return errors.Errorf("field `%s` not found", targetField)
+	return FieldNotFound
 }
 
 func (rd *msgpackReader) ReadString(v *string, targetField string) error {
@@ -399,7 +403,7 @@ func (rd *msgpackReader) ReadString(v *string, targetField string) error {
 		rd.curr.values[field] = raw
 	}
 
-	return errors.Errorf("field `%s` not found", targetField)
+	return FieldNotFound
 }
 
 func (rd *msgpackReader) ReadBytes(v *[]byte, targetField string) error {
@@ -429,7 +433,7 @@ func (rd *msgpackReader) ReadBytes(v *[]byte, targetField string) error {
 		rd.curr.values[field] = raw
 	}
 
-	return errors.Errorf("field `%s` not found", targetField)
+	return FieldNotFound
 }
 
 func (rd *msgpackReader) BeginContainer(targetField string) error {
@@ -459,7 +463,7 @@ func (rd *msgpackReader) BeginContainer(targetField string) error {
 		rd.curr.values[field] = raw
 	}
 
-	return errors.Errorf("field `%s` not found", targetField)
+	return FieldNotFound
 }
 
 func (rd *msgpackReader) beginContainer(field string) error {
@@ -504,7 +508,7 @@ func (rd *msgpackReader) beginContainer(field string) error {
 
 func (rd *msgpackReader) EndContainer() error {
 	if len(rd.stack) == 0 {
-		return errors.New("there is no open containers")
+		return NoOpenContainer
 	}
 	rd.curr = rd.stack[len(rd.stack)-1]
 	rd.stack = rd.stack[:len(rd.stack)-1]