The Best "Sustainable" Choice: Elf Bar ELFA Pro
Technically a pre-filled pod kit, but it looks and feels exactly like an Elf Bar 600.
How it works: You keep the battery and just swap the pods when they’re empty.
Pro Tip: This is significantly cheaper in the long run. Most shops sell a 2-pack of pods for about £5–£6, which is much cheaper than buying two separate disposables.