What kind of riding do you do? You may have a hole in the tire, allowing sticks and stuff to pop the inner tube easily. There could also be something very small stuck on the inside of the tire, popping the tube. If It's popping and your doing heavy duty off road riding you may need a thicker tire. Bontrager sells a version of the connection trail that is double the thickness of a normal tire. I use Bontrager tubes in all my bikes, they're great.
check to see if the tubes are getting punctured on the inside (the side against the rim/nipple strip), or the outside (the tire side). If it's on the inside, then it's an issue with the spoke nipples being exposed somewhere, not the tubes themselves. If it's the outer side, check for holes in the tire.
Run your finger along the inside of the tire also. If your tube and tire are being set correctly, it could be a thorn or piece of glass. Often, you can't even see them, but they will still puncture a tube.
Better way to check the inside of your tire than just feeling with your hand is to get a few cotton balls and wipe the inside of the tire with them. The cotton balls will catch the intrusion and snag showing you where it is, while protecting your hands from a cut from glass or a thorn. The cotton swabs can be added to your tool kit without adding any weight so you have it available while out riding.
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