I have also been through this and previously done some searching on the net and have found the following items:

Trangia in general are just too bulky, clumsy, just the wrong shape for a PSK. For normal camping, they are OK.

Trangia matlåda större - Trangia foodbox larger
Matlåda i aluminium. Mått: 20x13x7cm Vikt: 245g - Foodbox in aluminum. Size: 20x13x7cm Weight:245g
http://www.pinal.se/trangia-matlada-stor...ign=kelkooclick

and a smaller one
http://www.pinal.se/trangia-matlada-liten-p-494.html

and one with a handle
http://www.pinal.se/trangia-matlada-med-handtag-p-495.html


British Army Aluminium Mess Kit set
http://www.surplusandadventure.com/shop/...tin-310458.html
Good for cooking and keeping stuff, these are not water proof.

Mini Mess Box
95g, 13 x 9.5 x 3cm
http://www.qmstores.co.uk/gbu0-prodshow/BC-CN550.html
Watertight - remember to remove the rubber seal before cooking and replacing it afterwards.

SIGG ALU BOX MINI, 6.7" x 4.6" x 2.4
http://mysigg.com/index.asp?PageAction=VIEWPROD&ProdID=307
Watertight - rubber seal

Crusader Mess Tin
BCB International
http://www.bestglide.com/crusader_mess_tin.html
Also a bit on the bulky side