You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Material Nylon, Color Black / Brown /#01 / #02 /#03 / #04, Height 17cm (6.69”), Width 11cm (4.33”), Length 29cm (11.42”), Inner Pocket Main Pocket / Front Pockets / 2 Side Pockets / Back Pocket, Pattern Solid, Weight 390g, Closure Zipper
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($37.18): tRaDetRaCKeR
2. ($37.58): 2203ActiesNL
3. ($37.99): BG00c906
apply code in your basket (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): BGccd078, BG10OFFAFF, BGwhielabel, 13f142, BG10OFFAFF1, BANGGOODSD, 00c906, ADMITAD2212, 2022ACTIESNL, Terence, Tabby20, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204
(there’s a little possibility that old coupon will work)
Price history and price alert
Do you need price history chart (for all/most countries) for Men Nylon Outdoor Waterproof Tactical Sling Bag? 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)).