BRUH. I did a quick search online and read that there are some ransels (backpacks/Randoseru) for as low as $80. But most parents buy the $300 ones. And the price can go up to $800-900 for some....
WTH, the most expensive backpack my parents bought was for $70. And in college I bought something cute and practical for $36 (it was a Himawari bag).
But honestly,,,,, if you have the money, go for it. Buy whatever you want. Lots of ppl in the US send their kids to school with all kinds of expensive clothes and accessories. But for standard school equipment (backpack) to be $400+ seems crazy to me (but then again they spend lots of money on cram schools and other after-school study programs).
((and now I'm thinking about all of the manga with bullying, and they destroy the victim's possessions. I'd flip my sh** if someone damaged my $400 bag.))