Several years ago I viewed the web site of a backpack company (emphasizing frames, perhaps they bought pack bags??) whose external frames were advertised as being ultra-heavy duty. Rather than using cylindrical tubular aluminum for frames, they used contour-formed square tubing that included a formed bottom shelf.

My recollection is that this small family-owned company was located in Idaho or immediately surrounding area.

Please identify the company, plus web site URL.

Square tubing would also make them extra-heavy.

You’re describing “Bull-Pacs”. They are made in Idaho.

I’ve owned a couple, and still have a “spare” one. I’ve packed out a couple dozen elk using them over the years. They are indeed tough, but the suspension sucks azz and use materials from 40 years ago.

Much better options available today imho.

Dave

Bullpac link here

This is the pack. Many thanks.