With the Beemer it doesn't matter as the backpack straps into a special compartment on top of the bike, but otherwise I would just be careful of what I put into it. I was given that advice when I first learned to ride - so I'd give glass bottles of anything a miss, and anything particularly hard/sharp or otherwise likely to give you an injury. With most bikes there is the option of using a cargo net and strapping them on the back - that's what I've done in the past when the pack's got a big heavy or I've had to lug something like a few bottles of wine or tools/equipment.
And as for long straps - either cut them shorter or wrap them around and secure them - or don't use trendy school ones!
Yes, I am pedantic about spelling and grammar so get used to it!
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