I had something like 9 pairs of t-shirts, underwear and socks, 1 or 2 (don't remember) extra long sleeved cotton shirt and 1 extra pair of jeans plus shampoos, moisturizer, toothbrush and paste, shaving stuff, 10 inch tablet, chargers, headphones, passport etc. Yes they fit quite nicely believe or not. This was scotland about a month ago.
My folding method was: get some cheap packing cubes, one large with shirts (just flat), one smaller with underwear and socks (just put there) and one with toiletries, nothing special at all. You can stuff lot more than you think into 40 liters. Jeans and sometimes jacket I just stuffed there.
btw I was able to sneak that backpack to ryanair flight even :-D
My folding method was: get some cheap packing cubes, one large with shirts (just flat), one smaller with underwear and socks (just put there) and one with toiletries, nothing special at all. You can stuff lot more than you think into 40 liters. Jeans and sometimes jacket I just stuffed there.
btw I was able to sneak that backpack to ryanair flight even :-D