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500D PVC, Size: 60x 28x 25cm (expand)
Aliexpress
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Price history and price alert
Here is price history (for all/most countries) for Gocomma 20L Waterproof Kayaking Dry Sack.
Price records source(s): Gearbest
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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)).