MHMT
Member
You can buy soilid tubes for your bike at Walmart. Sure saved me a lot of headaches with the kids bikes, the goatheads were rediculous during the summer here. No more worries with the solid tubes, may ride a little rougher but well worth it.
I haven't used these personally, but I have heard that it is quite a bit harder to ride with them, and are not very good off of paved roads.
I have used the slime stuff that is used in ATV tires. Have rode over cactus and didn't get flats (it will make your tires noticeably heavier though) That being said I still always have at least 2 extra tubes with me on trail rides.
I haven't packed an animal out with a bike yet, but it makes getting there a lot quicker.