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rolltop closures
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Colin Krusor
(ckrusor) - M

Locale: Northwest US
rolltop closures on 03/07/2010 14:39:39 MST Print View

I've been considering making a water bag from heat-sealable ripstop nylon, and I'm interested in the possibility of using a roll top closure. I've done several tests and found that my prototypes invariably leak under pressure. Does anyone have any experience attempting to make a truly air-and-water-tight roll top closure? Has anyone had any success at this?

Roger Caffin
(rcaffin) - BPL Staff - MLife

Locale: Wollemi & Kosciusko NPs, Europe
Re: rolltop closures on 03/07/2010 15:26:27 MST Print View

Pressure from inside usually does leak out. Roll-top closures are meant to withstand external pressure.

Cheers

Travis Leanna
(T.L.) - MLife

Locale: Wisconsin
Re: Re: rolltop closures on 03/07/2010 16:52:46 MST Print View

>Pressure from inside usually does leak out. Roll-top closures are meant to withstand external pressure.

Huh, that's interesting! Learn something new every day!

Colin Krusor
(ckrusor) - M

Locale: Northwest US
roll top pillow on 03/07/2010 19:46:46 MST Print View

Roger,

I have heard it suggested that small drybags could be inflated and used as a pillow. Have you heard any accounts of this?

I guess I continue to mull over positive-pressure applications for roll top closures because I can't see why they should necessarily be leaky. The standard buckled canoe closure crumples and creases the material, and I can see how these folds could be leaky. But, as an alternative, I tried rolling the material tightly around a tube, and it still seems to leak under pressure.

If a way could be found to make a truly airtight roll top, a single bag could then serve as a water bag, a drybag/stuffsack, an inflatable pillow, and a pump for an inflatable sleeping pad.

Travis Leanna
(T.L.) - MLife

Locale: Wisconsin
Re: roll top pillow on 03/07/2010 20:16:25 MST Print View

In my experience, those rolltop bag pillows last about 45 seconds before deflating. I began to assume people meant to use them as a pillow by putting extra clothes in them, not by inflating them.

Roger Caffin
(rcaffin) - BPL Staff - MLife

Locale: Wollemi & Kosciusko NPs, Europe
Re: roll top pillow on 03/07/2010 23:25:09 MST Print View

> suggested that small drybags could be inflated and used as a pillow.
My experiences match those of Travis.

Cheers

Frank Deland
(rambler)

Locale: On the AT in VA
water tight bags on 03/09/2010 14:18:08 MST Print View

Here is an article on bags from 2006.

http://jwbasecamp.com/Articles/DryGear/index.html

Kevin Beeden
(captain_paranoia) - F

Locale: UK
Re: roll top pillow on 03/11/2010 12:06:56 MST Print View

I sometimes use a down vest inside a roll-top dry bag. Sometimes it stays up all night, sometimes it goes down very quickly. One day I figure out why...

Derek Goffin
(Derekoak)

Locale: North of England
rolltop closures on 03/12/2010 03:42:03 MST Print View

I have not experienced roll top closures staying inflated, but if they sometimes do I wonder if a film of grease,wax or condensation rolled in the neck of a well rolled closure of smooth coated fabric, would make the difference?

Colin Krusor
(ckrusor) - M

Locale: Northwest US
better seal on 03/12/2010 13:45:52 MST Print View

I've wondered about this as well. It seems that a bit of rubber (silicone sheet/film?) on the inside of the closure might give a better seal.

Travis Leanna
(T.L.) - MLife

Locale: Wisconsin
Re: better seal on 03/12/2010 14:30:31 MST Print View

Tried it.

I put a thin line of silicone around the opening--it resembled a ziploc bag closure (very rudimentary of course). The silicone didn't like whatever the stuff sack was made of and it peeled off. But, I did get a few attempts in at keeping it inflated. No avail.

Want a great pillow that doubles as a camp seat and frame for a frameless pack? Read my review of the Thermarest Lite Seat.

Sorry, back on topic now.....rolltop closures.

Edited by T.L. on 03/12/2010 14:31:58 MST.