X-girl × NEWERA リュックサック

It seems like you are looking for information on a specific backpack from the brand X-girl, in collaboration with NEWERA, identified by the barcode 5050000102186. Unfortunately, I don't have access to databases that can provide real-time inventory or detailed product descriptions directly from retailers.
However, X-girl is known for its streetwear style and often collaborates with other brands like NEWERA, which is well-known for its caps and sports apparel. The backpack likely features a trendy design suited for casual wear and is made with quality materials.
For more information, I recommend checking online retailers, the official X-girl or NEWERA websites, or fashion forums where such collaborations might be discussed. If you're looking to purchase, platforms like eBay, Grailed, or Poshmark could also have listings for it, depending on availability.