Think of the Subterra 23L first as a companion to the rest of your luggage. Its listed capacity suggests a different role from the larger 34L Subterra: carrying the kit you want nearby, rather than automatically replacing your whole clothing bag.
Assign the space before expanding the job
Start with the computer or tablet, charger, personal items and a light layer you normally keep with you. If that load is the main requirement, a smaller bag can be more manageable after arrival than a full travel pack.
Adding shoes and overnight clothing changes the assignment. Do not assume those items will fit neatly just because a larger Subterra works for that purpose. The 23-liter figure describes the listed model, not an interchangeable family-wide packing arrangement.
Older name, separate specification
This product is identified as Subterra 23L. A manufacturer link for an earlier 23L may redirect to a current 21L Subterra 2, which is a different product. That redirect is not confirmation of the older bag's pockets, dimensions or device fit.
Use photographs and documentation tied to the selected listing when evaluating laptop access and small-item storage. If the device is central to the purchase, its compartment needs more precise confirmation than a general association between Thule and technology bags.
Best approached as a daily kit
The interesting comparison is with other compact work-and-travel backpacks that can accompany separate luggage. Judge the bag while carrying your normal essentials and again after removing the computer. It should remain useful during the quieter destination part of the trip, not just on the way there.
