Buy on amazon.com
With versatile carrying options as a handheld tote or a hands-free backpack, this pack is suitable for all sorts of casual travel. The Patagonia Lightweight Travel Tote Pack is made from weather resistant ripstop nylon fabric with a polyurethane coating, a silicone finish, and Air Flow mesh shoulder straps that offer all day carrying comfort. The roomy main compartment has a zippered closure and includes a large zippered stash pocket and stretch mesh water bottle pockets. Side compression straps help to secure your load while the empty bag can be stuffed into its own pocket for convenient storage in between uses.
I love this form factor! I have a Sherpani Via pack (sadly discontinued but still going strong) that I use for short trips or just packed into my suitcase on other trips.
No padded shoulder straps, but they are wide & sturdy enough that they don’t cut into your shoulders over the course of the day.
I haven’t looked around to see if this is available elsewhere but if you find something like this, it is very useful!
Patagonia Lightweight Travel Tote Pack (Drifter Grey) https://www.amazon.com/dp/B01AA59RDK/ref=cm_sw_r_oth_api_U05Iyb7D4TP04
Sherpani Via Packable Daypack – Women’s (the REI historical listing – they have a “similar items” link to click on their site as well)