IPX4 Rating

Generally, a waterproof backpack should have better water resistance than a water-resistant backpack.   A waterproof backpack can withstand temporary submersion without leaking, while a water-resistant backpack only resists splashes or light rain. A waterproof backpack should meet at least IPX7 water resistance, while a water-resistant backpack only needs to meet IPX4.   IP Rating Explanation The IP rating is an internationally recognized standard for water resistance, set by the International Electrotechnical Commission (IEC). The higher the IP rating, the better the water resistance. There is no strict standard in the backpack industry specifying what IP rating a product must have to be called "waterproof," so the difference between waterproof backpack and water-resistant backpack comes from a common understanding of these terms. IPX7 vs IPX4 Testing Process IPX7: The backpack’s zippers are closed, and it is submerged in water up to a depth of one meter (measured from the top of the backpack) for 30 minutes. Afterward, the backpack is taken out, and the interior should remain dry. IPX4: The backpack is closed and sprayed with water in all directions (front, back, left, right, up, down) for 5 minutes in each direction, with a water flow rate of 10 liters per minute. After the test, the interior should remain dry.   It is clear that a IPX4 rated water-resistant backpack is sufficient for everyday situations, such as encountering rainy or damp weather. On the other hand, a IPX7 rated waterproof backpack is more suited for professionals who work in extreme conditions.