Places like deep in player owned Null Sec where the nearest dockable station is 20 jumps away, or even a Pirate controlled low sec where you are camped in to system and out of the stations.
Why do we go to these places?
To find targets. Typically, the more unfriendly the area, the more secure it's residents feel and the more kills you can get.
One of the primary problems is:
What do you do with loot?
You could leave it in your hold. But what if you die? What if your are full of loot and need to pick up more?
For the solo PVPer the best option is usually the: "Safe Spot Loot Drop"
In this scenario you would make a safe spot then warp to it and jettison your loot into a can there. I believe cans only last 1.5 hours so it's a very temporary solution. Should you stay and PVP longer you will need to flip your cans every hour.
I typically use this when I have the opportunity for a fight but don't want to risk my loot. I will drop loot at safe then go fight. If I die my loot survives and I can come back for it.
For Corps or Alliances deep behind enemy lines there is another option...
This works great if you are planning a campaign in a area away from stations or even if you just spend a lot of time in a system you can't dock in and want a place to securely drop loot in between fights.
Simply Anchor Secure Cans in your safe spot. You will need a hauler to get them there and a hauler to empty them but once in place they will allow you to keep your loot and be much more profitable when PVPing.