AWEHIRU Dry Bag Waterproof Sack Multiple Sizes with Shoulder Strap (Black, 2L)

I keep 2 folded in my backpack, just in case, has never failed me.

Although I ended up returning the product, I still recommend albeit it with a couple caveats. I was quite pleased that the material is thicker than expected. The clips to snap it closed are very sturdy. I haven't tested it for leaks yet, but the seams look well sealed. My main critique (and the reason I'm returning it) is based on the way the seller listed the dimensions. The 2L is listed as 7x5, but once the top is rolled down 3x as instructed, the usable space in the bag is much smaller than expected. You lose about 4 inches by the time it's rolled down and wrapped around to click closed. It'll work fine for 1-2 phones and ID/cash, but nothing of real substance. If that's all you need, I'd suggest a waterproof phone case with a strap instead. The 2L does not come with a strap, only a clip to snap onto another bag (NOTE: the seller made this clear in the description), but it's a bit too bulky to be hanging off a backpack, etc. for my liking.

Solid little dry bag, thick material