Interesting table Tony. Does n/a indicate unavailability of glasses or unavailability of information?
I registered pintpots.co.uk a couple of years ago so I had somewhere to whinge about weights and measures. I'll get around to it. UK pint glasses used to hold 24oz and had a line on the side saying 'pint to line'. This allowed room for the head on the beer, the way northerners prefer to drink it.
Now we have 20oz glasses, and it's a half litre pint by the back door.
Mutter,,, grumble.
Anyway, for the poster whose only issue is cubic inches instead of litres for rucksacks; use the rule of thirds
1 litre is 66 cubic inches
So 100 litres is 6600 cubic inches.
So just take the number of cubic inches given, knock off the last two numbers and add half of the remainder again.
eg pack size given as 3300 ci = 33+17 = 50 litres.
