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Dave and Zack –
I really appreciate the information you both provide based on personal experience. It would be a lot easier to be able to buy one of every version, and with every possible combination of options. Wish someone would hurry up and design the perfect mid, for every use, for all time!
Given the current offerings, the wisest and most frugal course might be purchasing a no-frills mid and accessorize it as necessary based on experience. Tie-outs can be added later with little expense. But -- it doesn’t seem that an upper vent, even if just a two-way zipper, would be practical as an “add-on” later as opposed to purchasing it that way.
Ironically, from all that I’ve found so far to think about (see below for a few examples from other thread, in addition to considerations you both describe), it seems that mid-panel tie-outs have a definite advantage to offer (stability in high winds) outweighing a few ounces extra for the tie-outs, but trade-offs (for/gainst) upper venting are subject to a lot of debate, at least with regard to condensation. Steep walls help address that problem.
Examples from other threads:
Richard Nisley at http://www.backpackinglight.com/cgi-bin/backpackinglight/forums/thread_display.html?forum_thread_id=22940
“By a wide margin my most comfortable mid in CA winter costal storms (70 mph gusts, 30 mph sustained) is my Duomid. None of my mids have failed but the noise and side panel deflection is dramatically less in my Duomid. This is primarily because of its lower profile and integral mid-panel side tie outs.” *************************************************
Richard Nisley at http://www.backpackinglight.com/cgi-bin/backpackinglight/forums/thread_display.html?forum_thread_id=18386
“My experience with the Duo Mid (mid guy outs version) is that it is rock solid in high winds. It has become my go to shelter.” **************************************************
Andy Howell, also at http://www.backpackinglight.com/cgi-bin/backpackinglight/forums/thread_display.html?forum_thread_id=18386
“I had the cuben Duomid out in a horrendous coastal storm on Friday night and more or less reassured myself that this is a bombproof piece of kit. The mid panel guy points are very useful.” ***************************************************
Commenting on a MYOG mid, Roger Caffin at http://www.backpackinglight.com/cgi-bin/backpackinglight/forums/thread_display.html?forum_thread_id=17344
“Add plenty of guy line tie-outs, and reinforce these on the **inside**. Allow a few stake loops at the middles of the bottom edges: they can be valuable in high wind.
“Consider some guys on the corners rather low to the ground *as well* to help keep the bottom of the walls off your face and feet.
“Top ventilation: crucial!!! Cover the hole with no-see-um on the inside. Use whipper-snipper cord to stiffen the edge of the hood. Allow for lifting the bottom edge a bit for inwards ventilation - also essential.” ***************************************************
Bob Marshall at http://www.backpackinglight.com/cgi-bin/backpackinglight/forums/thread_display.html?forum_thread_id=19232
“Quoted from MLD's mid page
" ‘The apex vent has been deleted for 2009. Not enough venting is possible in a Mid even with a LARGE vent for the trade off of wind and snow blowing in through the vent in harsh weather. Large Mids with small vents are pretty much useless and function only as a cosmetic "feature" that decreases strength and increases weight. I trust Brent and Erin's 300+ nights in this Mid for every type of harsh weather imaginable on this one!’ "
(NOTE: Bob quotes MLD’s explanation for dispensing with mid vents at some time in the past, but don’t believe that explanation is at MLD’s website anymore, and appears not to be “conventional wisdom” since MLD mids -- except Speedmid – now have vents). ******************************************************
MY OWN CONCLUSIONS THUS FAR ---
First, regarding upper vent for a mid shelter:
Upper venting seems “essential” when “necessary” to assure against lack of oxygen if the mid is entirely sealed – as in packed snow around the perimeter with door fully shut.
Also, if cooking inside with door fully shut, upper venting appears essential to provide oxygen and exhaust, like the vent flap seen in most pictures of Indian teepees.
Perhaps a boot-style flap, 3-4 inches square with snap or velcro, near the peak, is a simple, lightweight, inexpensive solution – easy to “add-on” later to basic mid.
Absent the issues of oxygen depletion or venting cooking smoke, the condensation issue is minimal with steep walls on a mid. Just don’t rub or bump against those walls.
Second, regarding tie-outs on a mid shelter:
Easy add-on for later, but seem well-worth including from the outset for greater stability in high winds – and to increase space in smaller mids.
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