Aliexpress
Click here… to search for Xiaomi 32L Shoulder Backpack on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
Coupon (77.21 USD): BG10OFFAFF1
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop)
Old coupons (from the oldest to the newest): BGOD1, 2019SPEDM, BGss506, AFfbG10, BGcamp305, 502C6B, BGBFAFF2019, BGCITYADS2019, BGVDay10%off, BGOL786, BGAFF10OFF, BGTT10, bGhOnEy10, BGdragonBoat, BGCAMP01, bgshOOp10, BgoFErTaSchInA10, BgcLuBofErtA10, BGZPBC15, BGTY704CP, BGCuponation10, BGHONEY2110, BG10OFFAFF, BGwhielabel, BG0b82e2, 13f142
(these coupons are old, so probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for Xiaomi 32L Shoulder Backpack? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).