My clear farvorite is the capsual style !

My actual capsual is aprox. 1" in diameter and 5" long. It?s machined from solid titanium (The next revision will possibly be made from magnesium or partly be).

Pros:
small
smooth edges
lightweight
has never asked for by TSA-sweepers <img src="/images/graemlins/smirk.gif" alt="" />
can be worn by necklace
can be strapped to nearly anything (knife sheath, belt, leg, arm, ...)
can be hidden inside rectum <img src="/images/graemlins/ooo.gif" alt="" />

Cons:
limited space
could be take for a kubotan (->TSA) <img src="/images/graemlins/mad.gif" alt="" />
very costy if you want a tailormade one

TINS:
The tins I still use are Trangia boxes, 165mmx90mmx65mm in size.

Pros:
big enough to cook in
small enough to be stuffed in packs
sturdy housing for fragile equipment

Cons:
unsuitable for business environment
to bulky for light summer dress
attracts attention of TSA-sweepers <img src="/images/graemlins/mad.gif" alt="" />
complicated to hide
complicated to get with you when naked (swimming)

BAGS:
I?ve never used them `cause I don?t like plastics at all but I would assume the following.

Pros:
flexible
can be used for waterstorage/treatment
lightweight

Cons:
get?s probably brittle after some time
easy to puncture
I don?t trust them

... just my humble opinion ...
Molf