The best replacement for drop ins is regular bottles.

The best alternatives to drop ins are rated as following:
★★★★★  regular bottles
★★★★★  ventaire
★★★★  dr browns
★★★  born free
★★★  avent
★★★  standard liners
★★  avent bottles
★★  tommee tippee
★★  bottles
★★  dr browns bottles
★  vent air
★  nuk bottles
★  dr brown's
★  playtex ventaire
★  glass bottles
★  dr brown
  avent natural

Your alternative for drop ins is not listed? Suggest!
Speaking about drop ins, one probably shouldn't forget about medela pump.

Other search terms related to drop ins and their ratings are:
★★★★★ medela pump
★★★ bottle warmer
★★ lansinoh bag
★★ ameda pump
★ medela
You have in mind a companion for drop ins and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of drop ins in all years. Click on graph for more.
drop ins
regular bottles
ventaire