I'm finally getting around to making my new pack, and still considering design options.

Is there any real advantage to the rolltop drybag-style closure that's popular these days? Previously I've used a drawstring with a lid pocket. The lid pocket, made with light materials, weighs only 2 ounces, and the rolltop closure uses more material than the drawstring (plus the side release buckles) so I don't see any weight advantage. The rolltop is maybe a bit more water resistant,
but not waterproof on a backpack.

I'd like to hear your thoughts on this.

So far I've only made the hipbelt (see pic)

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Always remember that you are absolutely unique, just like everybody else. -Margaret Mead