I've been a fan of water bottle kits. I've given many away a gifts and still have a couple on-hand. I just cannibalized one from my husband's truck yesterday in fact. It's a compact way to package things and you can get a lot in there.

There are two important challenges to consider: everything needs to be easy to remove and you need to have somewhere to put things when you want to use the bottle for water.

Here's what I unpacked yesterday:

-mylar blanket (fit going in but not coming out. see challenge #1)
-lanyard with SAK, howler whistle, magnesium block, mini LED, mini bic
-Ritter AMK PSK contents (except mirror and tinder quick)
-small bottle Coglan's water purifying tabs
-3 condoms
-10 pack tinder-quick
-2 storm candles
-2 tea lights
-AAA mag light + 2 spare batteries
-bandana
-triangular bandage
-4 bandaids
-wire emerg saw
-extra pair shoelaces
-2 beef jerky strips
-1 piece fruit leather
-1 lg ziplock freezer bag (see challege #2)