amazonbasics carry-on travel backpack liters Amazon Basics Backpack, with Laptop Compartment, 1.55 cubic Expandable Storage, Dual Use & Shoulder Bag with Multiple Compartments and Pockets, 13.8'' x 9.5'' x 21.5'', Navy Amazon Basics Travel Backpack Carry

30L : the sweet spot for combining daily use, work, light travel, and weekends away

The padding is dense, and theres a layer of mesh to promote airflow, which works well

Yeti Camino Carryall 35 Bag Reef Blue Yeti Camino Carryall 35 Bag Reef Blue Dimensions and capacity: 18 inch length

Other backpack coolers I liked: Cotopaxi Hielo 24L Backpack Cooler Cotopaxis Hielo backpack cooler was maybe the prettiest model I tested (even my mom complimented it, the only one of the bunch to catch her eye.) Its lightweight, comfortable to carry, and refreshingly easy to open and closesomething I came to deeply appreciate after wrestling with more heavy-duty coolers