There are plenty of good shipping scales on Amazon, what I do is weigh at home and underpack (so I have room for goodies) then after a trip do a best guestimate of what I've added. Never had a prob before. Else, step out of line and transfer to my carryon lol
Leaving home is never the problem for us. It's always coming home with goodies. My wife, for some reason, feels the need to buy books about the area we're in while we're there. I tell her I can get them on Amazon and have them shipped for free. "It's not the same!" No, it's not; we don't have to carry them home! On the way back from the last trip we had a very heavy carry-on, by design. And we thought the checked bags were ok and somewhat even. Not!
I usually feel pretty anxious checking bags for some reason. I will have to try to simmer down next time and consider moving out of line if needed. Part of my problem is not thinking ahead here. I should put the heavy bag on the scale before I hand the agent our papers. Still, with our own small enough scale we can know exactly what to expect at the counter. And, we can better gauge how close we're coming to maxing out weight as we pick up more things.
I didn't bother to take a carry-on bag this trip, which would have been helpful on the way back. I won't make that mistake again! However, it worked out, sort of. Which raises an off-topic question:
While in Hawaii, my wife suddenly decided she wants to learn how to play the Ukulele, which meant we had to buy one there because it "wouldn't be the same" to buy one when we got home. So we had this small-but-obvious, non-packable instrument w/canvas case. The sales lady claimed we could carry it on as a "third carry on - instrument"; this was allowed by the airlines. As it was, because I didn't have my own carry on, our bag count was ok even counting this. Finally, the question:
Are musical instruments treated as an exception to the "one carry on" rule in any/most cases? Or was the sales lady simply selling to us?
PS - and since I'm rambling, there have been at least 2 occasions where I've taken a picture of a book or recorded the ISBN and title in Evernote, only to find that the book was NOT available on Amazon, or was but at an outrageous price. I try to live-check on the spot, but when cell phone coverage is spotty that sometimes doesn't work. Anyone passing through the Lima airport anytime soon?
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We do buy our fair share of books at the local stores. When your bag is too heavy, it's time to try and buy later.