The material and zipper are well made. You have to tear the material a lot. I'm strict with this type of bags, the zipper strength is the best I've ever used. I had to give 3 stars because of the valve. In the closed transport state, the valve is "attached" with just two magnetic latches. If only one shoulder strap is used, the magnets are strong enough to hold the flap in place. If you want to carry the bag by the handle (which is part of the valve), once you pick up the bag with some weight in it, the magnets will detach and the bag body will fall off. I usually use a shoulder strap but sometimes I like a handle. Personal preference, wish it had a few inches more room. I think I should put less in it :/
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