Where are you?

I ask only because I question why you would even raise the question, speaking as a lawyer.

I can imagine that a scruffy looking fellow in public transit with an odly shaped pack might at the moment arouse scrutiny. And, as we say in my biz, you may beat the rap, but won't beat the ride -- as long as you have no individual component in your kit that is unlawful (please note that I did not say illegal -- the distinction is going to be the subject of a future post) you have nothing to worry about.

There are some legal concepts under which the accumulation of otherwise lawful items can be construed as the construction of an unlawful device, such as a fertilizer bomb. But, the intent behind all suck constructs lies in the context. You can carry 50# of amonium nitrate around with a gallon of diesel fuel if your have a farm and a diesal truck. If you live in an apartment of the upper east side in NY and are carrying same -- all bets are off.