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Just called 'shooting sticks' I got my current pair from aliexpress, think they were 'vector optics' brand and maybe 25-30 USD, probably cheaper if you wait for a sale.

The elastic does tend to...

No, the type I use are generally a bit flimsy to put weight on. If you get some of the bulkier type ones, that use legs like a camera tripod or walking pole, then I guess you could. Just a lot bigger...

Guilty as charged. One of the best hunting purchases I ever made. Hardly ever bother with the bipod these days.

Across gullies, steep uphill or downhill, places you'd never be able to get an angle...