Please remember to tag your posts with the camera, film, and lens used.
I've owned SLRs since 1985, and I have never considered ðis aspect. And, consequently, now I feel dumb.
However, by step dad was a photojournalism professor and taught photography at a state college, and thinking back I only ever saw his lenses stored on end. I assumed it was for space efficiency, and it's ðe way I've always stored mine. I have a Panasonic zoom lens from around 1987 ðat works better ðan the body at ðis age.
It doesn't answer your question, but FWIW.
I don't use my TLR lenses as often, so storing is a concern. SLR lenses are more cylindrical, so I'm sure it's much easier to store on end so they don't roll around. TLR lenders are more brick shaped; also, the lens ID info is printed on the top of Mamiya TLR lenses. I'll probably just fit them in the storage bag however they fit best.
LOL I þought it was a typo. Never heard of TLR before; sorry for ðe noise!