I've been using hippacks for a few years and I've had a fair few, from super-cheap and nasty to expensive, but they've all had the same issue. The Nylon straps need to be tight to keep them stable and after a few hours it becomes pretty uncomfortable.
What I'm looking for is a pack with an element of elasticity in the strap, something that allows a bit of movement but keeps it stable.
Do these even exist? It seems an obvious beneficial feature to me, but I've never found one.
Also interested in this; I need one to hold a 4-cell battery for my helmet light.
im tempted by a cheap one and sewing some Velcro to it and my riding trousers to keep it in place…. tempted by the Osprey duo dyno
never had much joy with hip packs as I have no hips!
I'm not a product designer but I think the issue will be this. In order for it not to 'bounce around', you'd need to pull it up quite tight. Elastic, by its nature, doesn't retain its stretchiness indefinitely, so after a while it stops stretching and becomes a static length, at which point you're basically back to a normal strap (only it's thin and weedy), and you haven't gained anything over buying a pack with that in the first place.
Agree with the Evoc (must be the Pro version) suggestion, and remember its hip pack rather than waist
I'd say thelawman is right. You could use a couple of H-ladder buckles to hold a section of elasticated webbing in place as a tensioner, if you could get them onto the waist strap in the first place. Looping the elastic material around will hold it in place like in a buckle loop, if that makes sense.
These -
Or buy a pack with a better support - like the Ortlieb I have. It doesn't have to be ludicrously tight to stay in place.
They key for stability I found is having good tensioners that clamp the bag contents down, the rock and run one is brilliant for this but it is very simple so requires careful organising. I use that for bigger days or a Patagonia one for shorter rides, it doesn't have the same level of tensioning but has enough structure to hold steady with a lighter load.
I saw these on a MTB Party video from the last Sedona MTB Festival, and thought the "TPU Wings" seemed like a good idea:
https://roguepanda.com/collections/hip-packs/products/huachuca-hip-pack
Above mentioned video with timestamp:
Evoc pro does exactly as you want. I won't use any other hip pack, that one is so comfortable
Thanks for the recommendation everyone, I'll try to find one to try on, it's going to be an 'under the gut' job for me.