A randoseru (?????) is a firm-sided backpack made of stitched firm leather or leather-like synthetic material, most commonly used in Japan by elementary schoolchildren.
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As for other (non-shinkansen) trains in Japan: while some do have some space overhead for small bags, many have none at all. For all of these reasons, we recommend traveling either with a small rolling suitcase or backpack, if at all possible.
Why do Japanese kids wear small bags? Traditionally these tiny cloth bags contain a piece of paper blessed by a Shinto or Buddhist priest, but increasingly the charm is a decorative item bought from a normal store and symbolizes the personal good wishes of a friend or relative.
How do they ask if you want a bag in Japan? “Fukuro ni oireshimasu ka?” (??????????): Would you like a bag? They will ask you this if you are buying only one or two items.
Narcotics such as opium, cocaine, heroin, MDMA, magic mushrooms, stimulant drugs (stimulant drugs contained in an inhaler or items containing stimulant drug ingredients), cannabis, opium smoking paraphernalia and psychotropic drugs are not allowed in Japan.
While flip flops are a big no-no for most occasions (save for a trip to the beach or a midnight run to the conbini), comfy ballet flats, loafers, boat shoes, or even a nice pair of slip-on sneakers are practical options. You might also notice that open-toed shoes and sandals are uncommon.