LOL when I was frequently flying could be easily over 40lbs in the backpack between two notebooks, phones, cables, chargers, batteries and sometimes with a messenger bag with another 20lbs.you're comparing apples to oranges
1) why do you need all that tech and battery charger for browsing in restaurant
2) lets say you have all that tech with you, so with 14'' full backpack is 20lbs, but the moment you have 16" and backpack is 21.3lbs that weight become unbearable to the point you cannot take it anymore, am I right?
Totally good point as the extra 1.3lbs could probably be saved elsewhere. I would pack and repack to balance the weight versus the airlines/country's restrictions to attempt to keep the weight down...
Key was a good backpack not worrying about the weight as it had to go with me one way or the other. You either opt for your own redundancy or roll the dice. Either way clients are not interested and just want the job done. Your computer goes down you can expect 24 hours leeway at best...
Q-6