Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Capacity: 20-35 Litre, Pattern Type: Solid, Handle/Strap Type: Soft Handle, Rain Cover: No, Exterior: Solid Bag, Model: B00120, Backpacks Type: Softback, Style: Casual, Carrying System: Arcuate Shoulder Strap, Main Material: Oxford, Item Type: Backpacks, Color: Black / Blue / Gray, Closure Type: Zipper, Lining Material: Polyester, Gender: Unisex, Size: 47cm*17cm*35cm, Interior: Interior Slot Pocket / Cell Phone Pocket / Interior Zipper Pocket / Interior Compartment / Computer Interlayer
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($68.81): tRaDetRaCKeR
2. ($68.81): 8wEbgaInS5
3. ($69.55): 2203ActiesNL
you should apply the coupon in your 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): BGAFF10OFF, BGCuponation10, 13f142, BANGGOODSD, 00c906, BGef96eb, Kortings10, 2022ACTIESNL, Terence, Tabby20, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for 18 Inch Laptop Bag USB Charging? There we go.
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)).