Funda ukuthi ungayikhetha kanjani i-vacuum steel enamandla e-vacuum efanele ye-silicone sealant, ibhethri le-lithium, izinhlelo zemithi kanye nezokumboza. Ihlanganisa ukukhethwa kwezinto (i-SUS304 vs. i-SUS316L), ivolumu yethangi, izinga le-vacuum, isivinini, uhlelo lokushisa/lokupholisa kanye namaphutha avamile okufanele uwagweme.