Could a wallet, phone, multiool, and headphones fit in here? maybe a pen and pad too.

largest thing you can or could fit in this would be an iPhone 4 or an iPod touch. Items as large as an altoids tin can fit inside the clipped portion

Will it fit a pair of handcuffs?

I edited my review and posted a pic showing it will hold handcuffs.

Will this fit the Leatherman Super Tool 300?

My initial response would be probably not... The "Super Tool 300" has a closed length listed at 4.5" which is exactly what the "Barnacle" is listed at and both of mine measure out at or very near the same... There is some flexibility/stretch room in the Barnacle so you may be able to stuff it in there and get it zipped... But most likely it will be a poor fit and you'll always have trouble accessing, zipping, etc... I just tried my Skeletool which is listed at 4" and it "just fits" so the extra 1/2 inch will likely be a problem for the Super Tool. Maxpedition has several alternatives that will work very well... Look for one the pouches with a total length of 5" or more... That will give you a little leeway but also hold your Super Tool without too much jiggle or slop. Take a look at the "3x5 pouch" or the "4x6 pouch" as good possibilities.

Will it fit a nikon trailblazer bonoculars? 8x25 it is 5.2 x 4.1 x 2.9

I think the binoculars are going to be too big to fit the barnacle, the case is pretty small, which is why I got it, I wanted something smaller than the maxpedition 4x6 pouch, but large enough to carry about two altoids tins......plus, the center divider will prevent you from putting one solid object, personally, I didn't need the divider so I cut it out of mines.

ASIN	B0015850KQ
Best Sellers Rank	#133,223 in Bags, Wallets and Luggage ( See Top 100 in Bags, Wallets and Luggage ) #17 in Backpack Pack Pockets
Brand	Maxpedition
Closure Type	Zipper
Colour	brown
Country of Origin	USA
Global Trade Identification Number	00846909002376
Item Dimensions LxWxH	12.7 x 12.7 x 12.7 Centimeters
Item Weight	59 g
Item model number	0308
Material	Nylon, Polyester
Number Of Pockets	2
Number of Compartments	2
Pocket Description	Slip Pocket
UPC	876404002373 846909002376

Maxpedition Barnacle Compact Utility Pouch Black AD

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