I wanted to add, I recently had to ship out two big boxes of corals for trades and it was a PITA with the specimen cups. They're amazing for smaller orders, but if you're packing 20+ corals into a box it's gonna get pretty big... Let's just say I'm back to owning a bag sealer. I prefer the cups for normal shipments since imo the corals get less stressed from floating instead of being squished into the side of a bag, but for 10+ frags a bag sealer is better. Happy to own both now, good options
