Go down and check coupons out. Remember to check price history if it is available. You probably want to know what is the best price?
Weight 52.9 oz. (1.5 kg), Color Black, Internal Volume 20 Liters (1220.47 in3), Material 1000D nylon fabric, Size 45x 28x 12cm / 17.7x 11.0x 4.7inch, Model BP20
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. ($68.42): BGAlerabatdo
2. ($77.55): BGAlerabatod
just apply this code 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): BGBP20, 502C6B, BGBP20TB, TTxBG10, BRANDNC, BGTBFL, bgtbfl, BGdragonBoat, BGSS10%SW, bGhOnEy10, BGTBD, 13f142, BG10OFFAFF1, BG4d9120
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for Nitecore BP20 20L 1000D Backpack? 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)).