I cap mine using a simple brass capper such as the TDC #209 Shotshell Capper from Cablela's. There are a number of places to buy the same or very similar cappers. I remove the springy clip from the end and replace it with a keyring. I put a slight downward bend on the business end and also use a punch and hammer to flatten the rivet just a bit more.
Works well for me.
I carry pre-weighed powder charges in small plastic containers, bullet carry varies with the bullet. I also carry a very small plastic funnel which makes pouring the powder a much easier and neater process.
It's hard to beat the TC 4 in 1 speedloader for carry powder and bullet but the straight capper is still needed.
http://www.tcarms.com/mlaccessories/loadimp/4n1quikshot.htmlI shoot mostly .45 caliber and those particular speedloaders aren't made for .45.