I use the Gate-8 Garment Mate bag exclusively and have done 400+ flights and ~800,000 miles with it in 3 years.
The bag does everything that it is advertised. 3-4 suits? Easy. 5-6 dress shirts - No problem. 5-6 days of undergarments - Into the shoulder pockets. 2 x Jeans/4 x Casual shirts - Into the zippered pocket. Has a removable Laptop bag as well.