How can I tell if a waterproof bag is quality?

1. The overall appearance is beautiful and generous, simple and uncomplicated
2. left and right symmetry, up and down correspondence, welding line uniformity, natural and smooth, no obvious creases, scratches, spills or discretionary burns, no different colors.
3. whether there is any strengthening design for the stressed parts and whether the welding is neat or neat.
4. whether the raw edges and threads are not trimmed.
5. whether the sewing is secure or not
6. whether the backpack is suitable and practical, comfort and practicality.
7. the most critical is what material is used for the main fabric, is it tpu laminated fabric or pvc mesh?
8. verify whether the waterproof performance is reliable, if the waterproof bag labeled as ipx7 waterproof level, then press to the surface of the water for 15-30 minutes, to see if there is no leakage of water immersion phenomenon. If it is labeled as snorkeling grade, then press it into the water for about 2-5 hours to see if there is any leakage or immersion.

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