I typically strap my bow to my pack (Exo4800), and haven't had any issues. It stays balanced and straight enough (for me), if i strap it on straight enough and tight enough. I shoot a compound so my issues would be different than if I were using a recurve bow. It's super low tech as I just use the compression straps to secure it to the pack. Exo sells a cam holder style bow carrier that you strap to the pack, but I have a short compound bow and haven't seemed to need it. It's certainly not a quick drawl type of deal, but I'm not sure that is what your looking for.
I haven't purchased one yet but have recently been intrigued by the Bow Spider. It seems to check some of the boxes for multiple uses (quick deployment, can mount in various ways ect.). I especially like that you can strap it to the back of the pack or the hip belt. It seems that when it's attached to the hip belt a hunter could use the bow to help stabilize binos and this would be quicker and less movement than getting out a tripod or other device. I couldn't find out the weight of the product and don't now how secure it is. You'll have to look at the video, but it seems like a quick release system to get you all ninja like with the mountain goat quick.
I can not figure out how much the thing weighs so if your counting ounces, you may want to look into that further as well. I figured that I would eventually see one demonstrated at a trade show so I could try it out first but haven't gotten around to that.
In short, i don't know how well this thing works yet but I was thinking along the same lines. Figured I'd pass it along.
Bow Spider is a lightweight tool designed to carry your bow for you in the field while traveling.
bowspider.com
From the website:
Universal bow packing system fits any bow and affixes to any pack, hip, tree, wall, or car for storage and access. It comes with a Receiver, 2 Load Lifter Straps, 1 Waist/Tree Belt, 4 Corner Screws, 1 Anodized Aluminum Post, 1 Long Mounting Screw, and 4 Long Corner Screws. This system is great for any bowhunter or competitive archer. You can easily stow your bow while you hike, stalk, or stand.
Review from website:
This past year I came across this new product, The Bow Spider. Most of the time, I’m fairly skeptical of new products but not this time. My initial thought here, “Game-changer!” As a back country bow hunter my bow is normally strapped to my pack as I’m attempting to handle the terrain from point A to point B. Sure, not carrying your bow in your hands saves on arm fatigue and/or banging your bow across the trees and rocks, but your not ready when that opportunity, the one you’ve trained all year for, presents itself. The Bow Spider is the solution. With its simple design, being able to reach back and slide my bow off my pack and be ready in seconds is worth its weight in gold to me. Then as every hunter knows, not all opportunities work out. Just reach back and slide the bow back onto the pack ensures I can get back to covering ground quickly and keep looking for that trophy. The Bow Spider is a must have and might just give you that advantage that you need. -Terry Nelson-
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