You need to chill them down,a fridge is ideal.Dont leave them sealed up, they need air.If you can do this they will last a week.They will look dead but when they warm again they will start wriggling again.BUT they need to be fresh when you start.
Any problems and they freeze and die,you can always use them as feed because they cant burrow away.you can always hook dead maggots.
But remember they are not that expensive!
At this time of year you can keep your maggots fresh for a week or more by leaving them in an open container such as a bucket and place the container on a concrete floor in a garage or similar.
The only thing to watch out for is damp and don't leave the maggots covered with an air tight lid as they'll sweat. Easiest way to make sure they can get as much air as possible if you're worried about leaving a lid off is to pull an old pair of tights over the bucket.
it all depends on how fresh your maggots are when you store them.
how long they last depends on how many times you take them out.
I store mine, usually a pint or two in the bottom of the fridge, ours has drawers at the bottom, ideal for calming the other half, and if i put them in when i get home from the shop, take them out to go fishing, and then put back whats left, i swear they'll last for weeks and weeks.
the more you take them out of the fridge the shorter they last.
And ignore dead maggots at your loss!
freeze what you don't use and add to groundbait, or particle mixes, and fish 8 or 10 dead or alive on a hair.
Lee, for some strange reason I've found that dead maggots can out fish live at times. It maybe they lie on the bottom exposed instead of crawling away. I always freeze any maggots left after a trip, if for nothing else but to add to ground bait or mixed in with hemp for barbel.
Try to remember that if you are going to fridge the maggots that you will need to put a tiny bit of water with them as a fridge will de-hydrate them.You will find that they last a lot longer than normal.And i do mean a tiny bit of water or your next stop wont be the tackle shop. It will be the solicitors....Andy(Staffs Angling)