Only used for a few feedings so I can't speak to their longevity, but so far they're great!I use a Spectra pump but prefer to feed out of Avent glass bottles for a variety of reasons. It drove me completely nuts that despite the bottles having the same exact diameter, the bottle collars were not compatible and caused leaking. My husband is (understandably) frustrated by complex systems and so I was absolutely thrilled that this brand somehow managed to make a bottle collar that is compatible and non leaking with both Spectra and Avent Glass bottle!I've written on the white sealing discs with dry erase marker and had no issues, I just wipe it off with my finger before washing.I haven't subjected them to any extreme tests, but just holding upside down with a little shaking did not produce any leaks for me, provided the lid was screwed tight. I have also not had the problem others reported of bottles unscrewing from their pump, but I will update my review if it occurs.Short version: great cheap additional bottle option, compatible with Spectra pump, lids compatible with Spectra bottles, Avent glass, Evenflo nipples, and Lansinoh Naturalwave nipples. Everything I needed!
Compact Baby Bottle Drying Rack With Brush By Termichy- Ideal For Working Moms, Family Visits, Camping, And More - Large Capacity For Convenient And Efficient Drying
34 Review
Organize Your Baby Bottles Effortlessly With The Termichy Large Capacity Bottle Drying Rack In Pink
32 Review
Maymom Wide Neck Breastmilk Collection N Storage Bottle 5.4 Oz; Re-Markable SureSeal Disc. Compatible With Spectra S2 Spectra S1 Spectra 9 Plus
26 Review
Nenesupply 9Oz Wide Mouth Feeding And Storage Bottle Compatible With Spectra S2, S1, And 9 Plus Pumps - Includes Nipple, Sealing Disc, And Compatible With Spectra S2 Accessories And Pump Parts
34 Review
Earth's Best Non-GMO Soy Plant Based Infant Powder Formula: Iron, Omega-3 DHA & 6 ARA, 21 oz – Comprehensive Nutrition for Infants
7 Review
🍐 Beech-Nut Probiotic Melties Pear Mango Spinach Yogurt Melts, 1oz (7 Pack) - Healthy Snacks for Toddlers and Babies
7 Review
🍼 Organic Stage 2 Baby Food, Squash & Peas - Earth's Best, 3.5 oz Pouch (Pack of 12)
7 Review
Plum Organics Hearty Veggie Variety 🍼 Pack, 3.5oz Pouches, 18-Pack - Organic Baby Food
8 Review