Whilst walking around the past few days, I've been mentally simulating having a backpack with varying amounts of features that are implemented in various ways. I think I've made my simple and inescapable choice: pogo wheel.
The enter-bag-without-dismount feature seems to add quite a bit of complexity for a situation that relatively happens for a small percentage of time using this imaginary backpack.
By far the biggest net benefit would be to direct the gravitational force of the backpack straight into the floor, without the literal middle man. The suitcase method has usability challenges, mainly caused by sharp changing elevation requirements (curbs, steps), the payloads would be subject to additional impacts, increasing the risk of damage, and it is unlikely that lifting the entire compartment when switching between wheeled and suspension modes is a simple engineering challenge.
Compared to this, the pogo-stick wheel is lighter (requiring less power to extend and retract, as well as a fixed weight) and smaller, reducing the likelihood of my feet colliding with anything when moving.
For true manoeuvrability, a 2 directional (normally called an omnidirectional) wheel will be required. To cut down on noise and to ensure compatibility with #TEOSS [gd0037], a wheel with a diameter larger than 100mm is probably a good idea. In research, it seems that wheels that size and up would be needed anyway to support the weight of the bag. I didn't look into it much, but it seems that the swivelling trolley wheels, diameter being equal, is only slightly cheaper. Since these wheels can't roll in different directions instantaneously and the chance of a foot collision is higher, I've decided to skip them.
Currently, I think the features in order of importance is:
- Can safely carry #Teti [gd0022].
- Retractable pogo-stick wheel that is safe to use with TEOSS.
- Soft, rolling straps.
- Hoverglide suspension.
Wheels I found yesterday:
First thing I saw was this really expensive wheel with a really expensive shipping cost. I think it's for a really expensive mobility scooter. The description says it's 3.7kg so that's out.
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Suprisingly, I still haven't been able to find an internet instance of a regular-ish backpack + wheel-ended stick. It sounds like an idea that even some YouTuber would've tried by now (there's quite a few "Is this the worst ___ in the world?" type projects these days, suggesting that content creators will still try a project even if it's unlikely to be any good practically)
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