Can't beat a classic. These uncoated ceramic donut magnets have a 1-lb pull, which makes them dandy for classroom or refrigerator use. They measure 1-1/4" dia x 3/8" ID x 3/16" thick and are polarized on the faces. You get a wrapped roll of 29 donuts.

You will survive, too, just like Gloria Gaynor, and in the woods, even. But only if you have this U.S. Army manual, cleverly titled: SURVIVAL, Department of the Army Field Manual FM21-76. It's 287 heavily illustrated pages of techniques for staying alive (add your own BeeGee jokes here) including orientation, food & cooking, fire- and shelter-making, rafts, animal, insect and plant recognition, and much more. This is the 1970 edition, but staying alive in the woods hasn't changed a whole lot since then. In soft-cover.

How to shoot an azimuth for fun and profit: Get the ultimate direction finder, a lensatic compass. It has a 2-1/8" dia face marked in 5-degree increments, a 1/4" dia sight lens, 9/16" dia bubble level, and a 1-1/2" sight with crosshairs. Measures 3-1/4" x 2-1/2" x 1-1/8" when folded and comes with an 18" long cord and an olive drab belt pouch. For instructions, go to www.armystudyguide.com, click on "prep for basic" then "land navigation," then click on "determine a magnetic azimuth using a lensatic compass." Piece o' cake.

Call it a MASK unit. This faux-military “Minor Surgery” kit from Voodoo Tactical® comes in a 7" x 5" x 2-1/2" canvas pouch containing: 6” wound probe; 3-1/2” stitch scissors; 3-1/2” tweezers; 5-1/2” bandage scissors; 5” straight and curved forceps; a #3 scalpel handle with disposable blade; pupil flashlight with mm gauge; alcohol pads; antiseptic towelettes; some 5/0 monofilament; and a gram of antibiotic ointment. Pouch will be OD, Black or Coyote; we'll spin the wheel of fate to decide. And remember: reenacting actual combat surgery without a license is still not allowed.

These clear plastic test tubes hold 10ml and measure 101mm (4") long x 16mm (5/8") dia and come with matching #5 corks. You'll receive a handy package of (10) which is enough for a ROY G. BIV optical display which includes the lesser-known colors of not-quite-right green, Monday-morning-blue and plaid. Made in USA.

Pair of alnico bar magnets, each 7/16" x 1/4" x 3". Magnetized end to end with the North pole marked, the North end painted red and the South pole painted blue. Come with a pair of keepers and a wood separator bar.

You buy as much cord as you like and make your own extension cords with these male and female electrical connectors. Also use them to replace damaged plugs or sockets. Rated for 15A at 125V, type B. Use with 14AWG wire or thicker. Connectors are 2-5/8" long x 1-1/2" dia at their thickest, with strain reliefs on both at the cable sides.

For traveling surgeons? Veterinarians? Dunno, but this is a small, retractable utility knife with a pointed, #11 scalpel blade inside. Measures 4-1/4" long with a plastic handle when retracted. Looks to us to be great for crafting, hobbying and pretty much any fine cutting. Made in England, and they ain’t talking.

This small stainless steel fine-mesh filter is 2" dia x 1-1/2" tall. It has fine mesh sides, a solid plastic bottom and slight lip around the top. Nice for small filtering jobs, but would also make a passable basket for a gerbil hoops game.

Whatever you call them they are super handy. Used for suturing, these are carbon-steel straight-locking needle holders, 5” long with narrow serrated 7/16” tips. And yes, you’re permitted to use them for other stuff if you’re not a surgeon. (Or even if you are a surgeon, actually.)

From ET Tech, this series 23 liquid micro-pump draws less than 300mA at 4-6VDC (5VDC nominal) with a liter-per-minute flow rate and up to a 3-foot lift. Not submersible, but suitable for hot-water apps and continuous duty. Measures 1" x 1" dia with a barbed 1/4" right-angle outlet and a 3/8" OD inlet on top. Great for fountains!