Yes, quality waterproof bags (like the one in your photo, typically made with materials like PVC, TPU, or waterproof nylon) do work-but their effectiveness depends on design and proper use:
1. Seal type matters: Bags with roll-top closures (plus clips/buckles, as shown here) create a watertight seal when rolled 2–3 times and secured. Zippered ones may need extra waterproof zippers (not just regular ones) to prevent leaks.
2. Limitations: They're great for splashes, rain, or brief submersion (e.g., kayaking, beach trips), but not for deep, prolonged underwater use (like scuba diving-those need specialized dry bags).
3. Proper use is key: Don't overfill them (so the roll-top can seal fully), and check for tears/holes before use.
For everyday needs (keeping gear dry in wet weather, near water), they're reliable if used correctly!
