Originally posted by Chicagoan
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Interesting comment on the strap lengths for the Luminary 12 and the Zeitgeist. Take a look at my post and comment in the Ultimate Strap Keepers method started by shoplarry in 10-13-2019.
I showed different ways that I rolled the straps and secured them with a strap keeper. Some of the pictures were based on tests we did on versions of the strap keepers that were sent out to the mods for testing before they were made generally available (BTW, these never come with any instructions on use -- they send us a pair and see what we make of it with no guidelines). In the post that I linked, I showed pictures of how I used a Peet's Coffee tie (the plastic piece that is attached to the top of a bag of Peet's Coffee -- G42 likes to use this in place of the insert that comes with TB face masks, and I also found that it was the right size and flexibility for this, so I showed pictures of what this looked like with masks, and also how I used to use this for strap keeping control on the narrow ended Luminary 12 straps (they also work well for backpack sternum straps)
I'll quote my text comment that included the statement On the L15 Luminary in particular, the amount of extra shoulder strap length to control was really astonishingly large:
I’ve tried rolling these both ways (under and over). To answer the question below about strap lengthening, I haven’t had any issues with that when the strap keepers are on. But working with slightly longer rolls of straps, where you keep the “rolled” portion retained by the strap keeper from getting too thick, does seem to work better. I’ll reference my 10-22-2020 post (#325 in the 2020 Wish List thread) to show what one of these looks like viewed from the side and from the top on the Luminary 15. (The original photos were from a sequence of test shots that we did on early versions sent out mods in the Admin forums. My comment in the post was “On the L15 Luminary in particular, the amount of extra shoulder strap length to control was really astonishingly large”. The strap keepers debuted in August/September 2019, a few months after this bag was introduced.)
epeterson started a thread on 12-03-2022 titled Comfortable carry for 5'6" person, narrow shoulders. In the ensuing discussion ittoujuu posted about his experience with the Shadow Guide 33 (a bag that was very comfortable for epeterson to wear in the SG23 size), as
I actually struggled some with the Shadow Guide, because I was having a difficult time getting the straps to ride comfortably on my back. I am...basically the exact opposite of you, dimensionally: a 6' guy with a broad back and shoulders. The straps are attached pretty close together at the top, and I found they were riding weirdly on my trapezius muscles, to where only half of the strap was in contact with my body, which turned those into hot points.
I even e-mailed Mike about this, asking if TB could move the strap attachment points out (spoilers: they wouldn't), and he said to try removing the frame, but...I could never actually get the frame out. It felt like I was going to damage something; it was in there real good. An interesting point he made was that the SG's straps are sewn in "flat," while some other bags have their strap attachment points flare out a little bit toward the outside, which is likely a more natural fit for wider people like me. For someone with your build, I imagine it will carry pretty comfortably right out of the box. The way I eventually got it to ride well was to really tighten the shoulder straps snugly and utilize the sternum strap
For both the BB and the SA, I noticed more pressure on the inner side (neck side) of the shoulder strap, whereas for the SG23, the pressure was evenly distributed. This matches your point about the attachment point "flare." MikeV would you happen to know which of the other straps are "flat" vs "flared?" In particular I'm wondering about the SG33, the S25, and both sizes of Techonaut.
MikeV replied
Originally posted by MikeV
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(Quick summary: they use different designs for the backpack strap on different model bags)
To see how complex this issue is, read the thread 12-30-2021 started by loma titled Zeitgeist straps too wide. Will they break in?
and read the posts from me and Cristina about our experience testing early prototypes of the edgeless straps, and comment regarding MikeV 's "I'd say for the most part, many people can't feel a lot of difference, especially with our Edgeless Straps." My basic conclusion from the early feedback on the edgeless strap prototypes, from people who had a lot of experience wearing different models of Tom Bihn backpacks, was that while the edgeless straps provide extra leeway for comfort of fit when the design is close to being right, they still need to get the backpack strap fit close to being correct for them to work. And there are a lot of different backpack strap designs, as MikeV mentioned.
One more data point about fitting small backpacks to larger frames. I'll mention how I did this for the Sprout backpack. I need to say that all my comments apply to the redesigned Sprout, where they modified the original Sprout design to carry letter size paper, which necessitated making the bag slightly taller and also moving the connection points for the webbing backpack straps further out. I'll just mention that since they retired the Sprout soon after the redesign, almost nobody who commented about how the Sprout couldn't work on adults had experience with the redesigned Sprout (e.g. see Tonya 's 03-08-2022 Zeitgeist vs Sprout vs Paradigm thread where all the people commenting on the Sprout had the original Sprout)
Take a look at my post (dated 08-30-2021) in the Some first impressions of the Paradigm and Zeitgeist thread started by bchaplin
Originally posted by moriond
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The quick summary is that I have links that show how the redesigned Sprout compares to the original Sprout in that Hack My Sprout thread, and that I posted the mods I used to lengthen the backpack straps of the Sprout if I wanted to allow for wearing a heavily padded jacket/coat or leave room so that the redesigned Sprout could be used in extended fashion for someone who grew taller in the linked post in the 2018 wish list. I was gratified by the number of small frame adults who commented that the redesigned Sprout worked for them, since I got almost no forum feedback on my posts.
HTH
moriond
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