There's no non-backpack strap version of the Aeronaut 30/45 (or Western Flyer), but they zip away and are completely hidden if you don't use them, and in such a way that there's nothing to ever get snagged if you check them. Some people apparently slide laptops/magazines/small stuff into that area, too.
I'd also highly recommend getting the Absolute Strap-- it's worth the money and lives up to the hype. It's worth it even for non-Bihn bags.
Re the Red Oxx XS Aviator-- it's a great little bag and excellently priced, but there's no strap. (There are various threads on modifying it to add a shoulder strap, but it's not standard.) For that reason, it's not so practical for me unless I'm balancing it on a large bag. But you can fit an incredible amount of stuff into it since it's an open space.
Last edited by turnleftbrighteyes; Oct 24, 2016 at 11:19 am
Reason: missing word!