Quoting Love Wedge +2:" I co-sleep as well and have one of these: He manages to wiggle himself out of it no matter how tight ... [snip!] ... but I'm looking to store the milk in the fridge until it's used. I suppose I could use the bags for that as well. Do they leak?"
Aw bless him they look comfy!! That's how we sleep too and I have achey hips from sleeping on my side, I hate sleeping on my back and wouldn't do it if DS is in the bed. It's smurf but I don't know how to prevent it though I'm afraid.
You can get tops for bottles so that you can keep it in the fridge, then you just had to put the teat and lid on, I have some Tommee Tippee ones which are quite useful.
The bags have a double seal so they should be fine in the fridge, the instructions say they recomend you defrosting them in the fridge lying down so I presume they won't leak, I haven't tried it yet :/