When I get the modmaker bottles I will send you one of those as well. The last batch of supersoft bottles have all been pretty shit IMO, and I'm hoping the modmaker bottle stands up.
The Lukkos bottles are niiiiice but holy shit the cost. I still can't bring myself to fill one, they sure do look nice on the shelf though.
As an addition to
@Train and his fantastic advice for sealing, I've had good luck using near-boiling water.... first, empty bottle, cap on as tightly as possible, pinch the tube and squeeze the bottle to set threads. Then, dip the cap end of the bottle into the hot water for a few seconds, remove and pinch the tube and squeeze the bottle again to finish seating the threads.
Squeeze gently while everything is still hot so you don't deform the bottle at the threads. Dip in cool water and the threads should now be pretty well formed to the cap. It's the same as the lighter trick without the lighter is all, really.