Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Xiaomi 15L Backpack [EU] (-3 USD)
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
Coupon (20.69 USD): BGTY704CP
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG412YU, bGhOnEy10, BGAFF10OFF, BGdragonBoat, BGCAMP01, BGSDJKJ5, aa6f59, bgshOOp10, BgoFErTaSchInA10, BGXMBAGG2, BGSHHA, BgcLuBofErtA10, BGZPBC15, BGCuponation10, 13f142, BG10OFFAFF, BGwhielabel
(these coupons are old, so probably won’t work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Xiaomi 15L Backpack [EU] (-3 USD)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi 15L Backpack.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).