I have a number of Zebra / Seagull /MSR pots. I have a 10cm Billycan, a 14cm billy can (both billies prior to plastic clips being fitted), an MSR Stowaway pan(also has seagull branding on it) and the little 12 cm Zebra head pan with tray in it. All have provided good service and the MSR I am looking forward to using with an alpkit chainset (the lip isn't as prominent as it is on the Zebra pan) just to see if it'll work.
If you're gonna be cooking a main meal you'll want the 14cm one at least, anything smaller for even boil in the bag is going to struggle a bit.