• everything2.com — describes the two types... 1) 500+, with no covering = huge fireball that lasts for 10 seconds or more, and 2) 10+, with a tape covering = big BOOM

• 95 sparklers inside a dryer
• 60 sparklers inside a dryer
• construction video of 144 sparklers + lots of duct tape, DIDN'T EXPLODE though... too much heat, not enough tape?
• 3 boxes of color sparklers, still pretty big!
• 48 sparklers + two rolls of electrical tape, construction images
• 32 sparklers + 2 rolls electrical

• 12 color sparklers inside half a large roll of electrical tape (worked well)
• 12 color sparklers inside an entire roll of large electrical tape (didn't explode; instead acted as a rocket... if we use this sturdy of a container, perhaps we need to light it from a completely sealed container, via an electrical squib (I especially like the RadioShack part#272-1139, since it comes with wires already soldered on))
• more sparklers, more tape.... things seemed to fail a lot... is there a way to totally seal the package, but still have a way to reliably ignite it?
  • use some kind of electrical ignition, so you can run an electrical wire through the shell/case, but that puncture remains sealed
  • hot-wire ignition — is it possible to run a wire from the outside to the inside of the package, put some black powder on the inside (since blackpowder is more readily ignited than sparklers), and heat the outside end of the wire (with more black powder?), and that be a reliable way to ignite it? if so, that might get around the delicate/precise/etc. annoyances of dealing with electrical igniters, but still allow the package to remain sealed.

• make sure they're the METAL-core sparklers, NOT the wooden-core-with-paper ones, those are an entirely different composition
• cut the ends of the sparklers off that have no composition on them... they're just dead air space that contribute nothing to the explosion
• Use electrical tape or something similarly dense... it makes a much stiffer, more compact wall. Also, electrical tape is naturally stretchy, so it makes it effortless to make the whole thing tight and compressed
• Be very careful with the single sparkler sticking out.... it can break, or even if bent, the burning material can flake off...
• Only use ONE sparkler for the fuse... pressure build-up is very important, and as nice as it might be to use more than one for sturdiness, it doubles or triples the amount of gas escaping, making it less powerful
• Despite what other people on the internet say, don't put so much emphasis on tightly packing the tape that you squeeze the sparklers to the point that flammable material starts flaking off. First, get a single medium-tightness layer of tape on it, just for basic structural integrity. Second and further layers can be much tighter.
• Using cannon fuse instead of a sparkler might be a good idea... others on the internet have said it's good... don't have to worry about breaking it that way

• One sparkler WILL NOT burn all the way down if it's heavily coated in tape (why? not sure... heat dissipation?)
• One piece of good cannon fuse WILL burn all the way through, no matter how many coats of tape are around it
• Cannon fuse may not reliably ignite sparklers... to counter this, make sure the fuse is in contact with at least half the length of a sparkler, if not more

• stick the "bang!" version atop a model rocket
• wrap the sparkler bomb around a WD-40 can

Sparkler/pipe bomb (two caps)

• 6" PVC + 5 gallons of gasoline
• PVC
• 1-2" PVC

Sparkler/pipe rocket (one cap)

• 104 sparklers (which makes you think of doing a rocket + bang, by putting a VERY SOLID partition in between)
• 36 sparklers
• homemade paper cardboard container
• 15 sparklers + metal tube = whoosh, BANG!
• 58 sparklers, is tied down and doesn't go anywhere, but clearly has a lot of oomph
• four different rockets, with varying success

Sparkler/pipe fountain (one or no caps)

• 5000 sparklers = HUGE fountain
• copper pipe fountain