Are you limited to size or type by your scoutmaster or parents ( aka adults.) Secondly what tasks will you be performing with this knife? Anything can be broken with enough brute force or ingenuity. Swiss Army Knives are great pocket folders. If you want a sheath knife,
www.ragweedforge.com has an excellent selection of inexpensive swedish moras. A somewhat more robust knife is the COLD STEEL mini Bushman. The rolled handle isn't exactly ergonomic and the sheaths junk, but they last forever.