Just check coupons out (with price alert and history). What is best price?
Size: 30cm*20cm*53cm, Weight: 1.2kg, Material: Nylon
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
1. ($38.19): BG589b2e
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): bGhOnEy10, BGdragonBoat, bgshOOp10, BgoFErTaSchInA10, BgcLuBofErtA10, BGAFF10OFF, BGCuponation10, 13f142, BGBP156, BANGGOODSD, 00c906, BGef96eb, Kortings10, 2022ACTIESNL, Terence, Tabby20, 2203ActiesNL, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, hoNEYbGdeAlS, BG8ReviTrage, Cuponation9, COUPONSDE1wk, BGcoupon8off, BGGutscheine, BG00c906, BG8OFFCOUPON, TTBLACK5
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for OZUKU 15.6 inch Backpack.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).