[PrincessPerky]

We almost always pack a drink for the kids, (and me if pregnant or nursing.)

The juice boxes get squeezed by my one year old so they are out. and a psp bottle of juice gets spilled at the first bump! I have never given my kid a juice bag but I imagine it would spill worse than the box. Not to mention we water down the juice even for me (to sweet straight).

The tupperware lids are not spill proof and the screw top lids of a billion other brands are not usable as cups for DH and I, not to mention take up a huge amount o cupboard space! Same with sport bottles.

So we use the Take and Toss type cups, because the lids for the little containers fit on the cups, so no worry about leaking.
We just trade straight lids for sippy or straw ones when they are ready to drink. Dh doesn't even mind drinking out of it with a straw, though mostly mom and dad just remove lid sip and replace.