Ok, I know this is a COMPLETELY subjective question, but I'm interested to hear insight. I'm going on a 10-day trip to Scotland in August. I'll be flying there, and then mainly traveling by train and bus while in Scotland (and one leg in a rental car with a friend).
I have a 55cm soft-sided Bric's bag (spinner, not my ideal, but that's what you can get these days) whose capacity I calculated at around 28 liters -- and I've seen one online source that said 30 liters (another one said 45, but that is obviously way too much for this bag!!).
I'm thinking about getting a hard-sided Delsey while the French soldes are on . . . according to Delsey's details, the suitcase I'm considering (clamshell spinner) has a capacity of 40 liters (or one with slightly different dimensions that has 42.88 liters).
Both bags meet the standards for EasyJet's carry-on dimensions.
So - while recognizing that this isn't an exact science, and who knows if we're really talking about 10 liters' volume difference between the two bags anyway -- and keeping in mind that I'm one who loves her creature comforts and always seems to stick that extra thing (make that those extra things) in that I think will make my trip easier -- but that I also lug my bags around myself with no fuss . . . .Would it be worth buying another suitcase to have 10 liters more packing capacity? (And a hard-sided bag that will stand being checked better in the future when that's the case). Of course also in my mind is the fact of having to store another suitcase somewhere in my Parisian flat . . . .
(and yes I know value is all in the eye of the beholder as well)
The funny thing too is that I basically hate spinners, but it seems all you can find any more, so I've given up that battle. I did see some nice Eagle Creek bags when I was in the States that were two-wheeled, but they had the dreaded center-handle only (you know with a T at the top for the handle) that I can not abide.