Keep the smaller Onyx tied to its packing role
The 25L is most relevant when your normal belongings do not require the larger Onyx's additional space. Include charging equipment, food, and any clothing that travels with the computer when evaluating the capacity. Check compartment shape and access, since a nominal volume cannot establish how well all those items coexist.
Capacity belongs in the exact model identification
Use the 25L figure when comparing specifications and offers, not just the Onyx name. The 36L listing should not supply measurements or organization details by assumption. Verify laptop body dimensions with its cover and obtain exterior size for travel, especially if a particular baggage allowance is part of the intended use.
Compare it with your actual load
Put this model beside another backpack in the comparison tool. Missing figures stay marked as unknown, so you can see which measurements need checking before you buy.
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