and never try to hand-hold a lens that won't fit in your boot
and Neuro is right.... an apartment is a flat
Wait, wait...boot...is that the things on my feet today, to make it easier to walk through the 11" (or is that 28 cm?) of snow that's fallen so far here in Boston...or is that the large compartment in my car where I carry groceries, etc.? Because a 70-200/2.8 won't easily fit in the former, but an 800/5.6 will easily fit in the latter.
How about either? BTW, I have a pair of size 13 boots that I use in the far North that you could slip you 600 f4 into.