I’m not sure what the specific “phobia” is with drawstrings, so my reply may “miss the mark”.
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Drawstring closure when extension collar is NOT fully extended:
I draw the closure tight & ROLL the extension collar just like a roll top, then take whatever compression webbing the pack has (many have an over-the-top compression strap) & loop it over the top & through the haul loop or ice axe loop (whichever direction makes more sense with your pack) & then either back over or tie it off there. I think if you tried it with your pack, you would come up with an appropriate sol’n. Works fine – nothing can get in (e.g. rain), or out (like small loose gear – which should be in a stuff sack anyways). The compression strap keeps the ext. collar rolled nicely
If this isn’t clear, please reply & I’ll try to ans. any questions you have. I’m trying to keep this post shorter than some of my others, so that I don’t bore anyone.
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Drawstring closure when extension collar IS fully extended:
draw it tight & wrap the cord around the closed opening once or twice & tie it off real tight. If it’s nearly full, but not totally full, b/f I “choke” the opening with the draw cord, I twist the fabric just below the opening 1 or 2 turns & then wrap the drawcord a couple of times around the twisted collar fabric & tie the draw cord real tight around the twisted fabric
Haven’t had anything but a few drops of rain get in if I’m not using a poncho that day & the ext. collar is fully extended & cannot be twisted b/f tying off – the drops that entered were during very heavy rain. Besides, I use silnylon stuff sacks & trash bags inside (or a Gossamer Gear packliner), so even if some water entered the pack nothing would get wet.
[Note: so that i don’t confuse anyone who has read some of my other posts, this post refers to a period of time b/f i purchased a GossamerGear G5.]
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Sorry if I didn’t understand the “phobia” & wasted everyone’s time with this post. Hope this info helps someone.