I have the travel pro deluxe tote which I use for work. I work on the Embraer e170/e175, I don’t have an issue with it fitting under the seat. That being said, I also have a travelpro rolling tote which I like to use for two day trips because I don’t like the weight of carrying the tote on my shoulder.

I have no issues fitting this under the seat on my planes. https://www.amazon.com/Travelpro-Luggage-Maxlite-Lightweight-Suitcase/dp/B07BL4XRQ2/ref=mp_s_a_1_2_sspa?keywords=travelpro+rolling+tote&qid=1578745817&sr=8-2-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUE2M045VkFFVExQMlomZW5jcnlwdGVkSWQ9QTAwMzU2ODJKRlRYOTlFRUE2TFkmZW5jcnlwdGVkQWRJZD1BMDMwMjczNTZPSkpHTkNJVDVJSiZ3aWRnZXROYW1lPXNwX3Bob25lX3NlYXJjaF9hdGYmYWN0aW9uPWNsaWNrUmVkaXJlY3QmZG9Ob3RMb2dDbGljaz10cnVl

Also- as long as the bag can fit completely underneath the seat in front of you, the flight attendants should have no issue letting you put it there.

Haven't used this but it seems like a popular choice:

Samsonite Underseat Spinner

https://www.amazon.com/Samsonite-Spinner-Underseater-Port-Ocean/dp/B07H8TX91R/

Edit: another option

https://www.amazon.com/Travelpro-Luggage-Maxlite-Lightweight-Suitcase/dp/B07BL4XRQ2/