What sized travel backpack for city breaks?

Soldato
Joined
29 Jul 2004
Posts
6,628
Location
Esher
I want to buy one of these jazzy travel, my tatty old Adidas bag has had it.
I don't really like using those little suitcases so would rather get a travel backpack, now it seems it's all done in litres and I have no idea what size to get.


Would something like this be big enough for 2-3 days abroad and be OK for carry on? Or is 38L too big?
 
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