It's not my custom to give 5 stars right after getting a product but this product earned it.This bag did a stellar job and the water resistant phone case save my iPhone 7 plus fro certain water destruction.The scene: New to Kayaking I purchased the 20L Waterproof Bag thinking I might need to protect gear from wet. This would enable me to store items needing to stay dry under the deck at my feet. There is little to no room in Kayak hatches.The Ultra Dry Premium 20L bag caught my interest because it had nice handle and straps to carry it as a backpack. (any water trekker knows shorelines tend to be muddy slides or rocky all hands on deck climbs) and the phone case could dangle around my neck or be tied on board (has quick release buckle. (which was critical for me) Did a stream trek with multiple downed trees and one hair pin passage through newly downed trees completely covering the stream. I had let my daughter use the Kayak on this stretch little did we know we were coming up on this bushy situation. Another person in our group got hung up in the tangle and My daughter in my Kayak with iPhone in case and Ultra Dry bag onboard got distracted helping the other person and was soon sucked under the downed trees by the current. She quick thinking popped out of the Kayak tipping it into the full current submerging the Kayak with the Ultra Dry Premium 20L Waterproof bag below deck. Holding on with all her might to try to retain the kayak further down into the mess of branches I told her My iPhon is on there she was able to grasp it and pinch the release buckle one handed and recover it in time hand the phone over to some one else letting go of the Kayak to submerge disappearing under the brush and head down stream.Upon retrieving it down stream and draining it out there was the Ultra Dry Premium 20L bag still below deck. The Kayak was under water in rushing current for about 5 minutes recovered and drained after10 minutes. iPhone in dry bag was under water in current for 2 minutes. Results iPhone was completely dry. Ultra Dry Premium 20L Waterproof bag had a little seepage at the opening. There were drips of water inside the bag which was folded over three times and buckled but nothing was soaked didn't even think about checking the bag until we got to the takeout (for the Car Remotes which were not wet) an hour later. So I think this product saved the day.