Might share a imo cute trend in Japan regarding bags; behold the 痛バッグ (itabaggu) or 痛バ (itaba).
痛バッグ as a word consists of two parts, 痛い (itai, pain) and バッグ (baggu, bag). So literally pain-bag or if I had to translate it: "Cringe Bag".
There are exactly two places in Japan you wear those, Ikebukuro and Akihabara, both to go shopping for cute anime/manga stuff or going to one of the many cute cafes to really escape reality into a pastel coloured, well scented dream land. I think this trend started with Fujoshi, just plastering normal bags with badges of their husbando.
However, over time they added more stuff and it became very fun to just go into stores and put all kinds of things on those bags, and it became such a nice past time that the trend transcended fujoshi-dom and became something even normal 9 to 5 office workers would do, so companies are now offering a wide arrange of blank bags with those see through plastic protectors over it. (Getting all the badges isn't easy and a lot of collectors see them as their treasure, so the added protection is welcome!)
These days they come in all shapes and sizes, like this cute little rucksack with a front protector to decorate.
Even my beloved Washi Tape can be used to decorate these and if you run around with one of those in the affore mentioned areas, sometimes other 痛バ fans will come up to you and strike a conversation on how nice your bag looks. And yes, making one is a genuinely enjoyable experience, you get to shop for cute stuff, get to be creative and can be as frilly as you want with it.