I owned a Seal Line Dry bag for many years, which was awesome - 100% dry and I loved it. Unfortunately I have no idea which model it was. I recently used it on a river tubing float as a portable cooler for a few bottles beers and dropped it - good news is that it contained all glass, bad news is that the bag got punctured and needed replacing.I went on the Seal Line website to figure out which model I might have had, and ended upOrdering the Blocker. Unfortunately it wasn’t the same model, as the Blocker is much thinner than my bag was. As soon as I got it I took a paper towel and put it in the bag, wrapped it up and sealed it in the bag, and threw it in the pool to float around for about 90 mins. When I opened the bag, the paper towel was very slightly damp, and there was some dampness in the bag also. This definitely came through the bag as opposed to it not being sealed (ie folded) properly. Not very damp, but this never happened with my previous bag.So... long story short, I wouldn’t say this bag is 100% waterproof, but it will definitely work to protect any important stuff from getting wet on a boat etc, and even for a short swim to the shore. But I wouldn’t go “floating” with it and have car keys and the likes inside of it.I have given it 4 *’s because for the thickness of the bag it does work well relatively speaking, and I guess I didn’t buy a like for like replacement. And What I do like is the rectangular shape, which makes packing it much easier.But I have also Gone ahead and ordered a Seal Line discovery dry bag, which based on the spec is thicker, so I am Hoping this will be the one I had previously.This is a great ultralight but durable drybag. I very much prefer the heavier denier fabric of this bag over the very thin silnylon from competitors like sea2summit (not knocking s2s, it's a good brand too).This bag is durable enough for ski tours in the sierras, so it's my go to now.Also, if you like nickelback, this bag will keep your CDs dry when you go to the beach and crank tunes.Well, this lasted for 2 months. The fabric is much thinner than expected from seal line. More of a wind breaker thickness than the 3-5mm durable material im used to with this brand. I kept the product after opening to dissapointment to keep my Coast Guard overnight clothes dry and thought it would be ok to put in a helmet bag. Well, walking past a tool box on the hangar deck left a nice gash in this. I would not recommend.Reasonably priced at $15/5L sack. Waterproofing works for now. The pattern and color are more flashy camo style. Not meant for the woods.This purchase was a gift that was well received. It's features were a request of the receiver.Awesome. This works well for my needs in terms of protecting my gear and also helping me to organize gear within my pack.Another misleading product description. Made in China, not the USA as stated.I try not to support the CCP whenever possible.I’ve already scheduled the Amazon / UPS pickup.Description says made in USA, but it is made in China. Will be returning.Ordered two sacks and returned 2 sacksLove the sealing method but the rigid nylon insert that folds over at the top was snapped on both items.Had a third one delivered and it was OK but we’ll see how it holds up over the next 2 months.Otherwise they seem lightweight and waterproof for the time being.I bought 3 of these bags, a 5L and two 10L bags to fit into my new kayak. I have used larger Sealine dry bag that used thicker material than these ones, so I was a little nervous, but all 3 were great! I was traveling for 21kms of portages and kayaking in the rain. Some waves in the one lake came over the rear hatch of my kayak where I had my two sealine bags. By the time I got where I was going there was about 2 inches of water in the rear hatch that the bags were sitting in. The bags kept all my clothes and food dry. I would definitely recommend these bags.I bought 3 of these bags, a 5L and two 10L bags to fit into my new kayak. I have used larger Sealine dry bag that used thicker material than these ones, so I was a little nervous, but all 3 were great! I was traveling for 21kms of portages and kayaking in the rain. Some waves in the one lake came over the rear hatch of my kayak where I had my two sealine bags. By the time I got where I was going there was about 2 inches of water in the rear hatch that the bags were sitting in. The bags kept all my clothes and food dry. I would definitely recommend these bags.I had a friend recommend this brand and I am happy that i took his advice. At first I thought that 10L was going to be too big, but it is a perfect size for my paddle board. It holds my towel, my cell phone pouch, sunscreen, keys, and blue tooth speaker and still room to spare. All of my items stay perfectly dry inside. I love the way it rolls up and then clips to my bungie straps on my paddle board. Definitely would recommend this.Had one for 3 years. Use all the time for camping. Forgot it out one night and raccoons ran off with it. Buying new to replace.