Global Wealth Builders, Inc. wrote:
Every pilot should take inventory of his collection of junk and keep on the
ground that which he hasn't used after 3 flights. It's just not necessary.

As a renter, you really don't have a choice but to carry all your
paraphenalia with you. It takes me 15 minutes to make my nest for a long
cross-country. I carry two medium duffles; one for flight gear, the
second for IFR charts. The contents can be reduced depending on the
length of the trip. The purpose of the duffles is to speed departure
from the destination airport. With the duffles, you can just dump all
the gear in loosely and neatly put it away later.

Standard cockpit setup includes:
4-6 headsets, two yoke mount PTT's
1 multi-port cigarette lighter adaptor
1 portable intercom
1 handheld GPS and remote antenna
1 handheld nav/com radio
1 kneeboard w/flight log, pad and pencil
1 lapboard w/charts and flight plan