Nitecore BP20 20L 1000D Backpack (Banggood, Aliexpress: 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 (the best price with coupon)).
You can create price alert here, copy coupons and view price 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 coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($68.42): BGAlerabatdo
2. ($77.55): BGAlerabatod
this code has to be applied 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
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Do you need price history chart (for all/most countries) for Nitecore BP20 20L 1000D Backpack? There we go. The lowest price was: $54.43.
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)).