The roll top opening on selected bags and packs allows for adjusting the volume depending on what you need each day.
The Atomic Travel Pack 35L is a neat travelling companion if you prefer a pack to a wheelie bag. It comes, with a water and stain-resistant outer fabric and easy-clean Tarpaulin lining inside. It’s 35l so take a lot of gear. Then it’s got a roll-top opening and front pocket, plus separate compartments for your laptop (specially padded), your sneakers and even a sleeve for documents.