Don't know the weight
But everything I need is there: 2 sets of eye/ear protection, targets, tack-driver(big stapler), markers, extra mags, pistols, ammo (most in plastic Wal-Mart bag), first aid kit, Leatherman tool (not really a Leatherman, but heavier duty), a few rags, and masking tape.
Most weight comes from the number of pistols and amount of ammo.
Usually, I buy too much ammo and only leave the range when I get tired of reloading the magazines or picking up my spent brass. I keep most of my ammo at home (big ol' bucket of .22lr, 1k+ of .380, a few bricks of 9mm, and lotsa .40) and make sure i leave the range with a loaded .40 and an extra magazine.
The range I use is outdoors, with multiple pistol lanes (horse-shoe berms), adjustable pistol/rifle with large earthen backstop, 50 yd, 75yd, 100yd, 150yd, 200yd, to 750yd lanes. Turkeys, geese, chickens, goats and a couple dogs wander around (not targets! pets!). There is also a skeet range at the far right corner. Reactive targets, appliances and multiple 2x4/cardboard target stands available.
I've seen as many as 4 people out there at a time! Mostly it's me and my dog (trying to refuse the advances of the range dog) and maybe the curmugeon retired-FBI owner of the place twanging away on a guitar or doing some minor gunsmithing.
He sure does make sure I pick up my spent brass! I fire .22 to .40 (ok, no .25 or .32) so I end up picking everyone else's brass ("Don't be picky!").
My range bag sure is a lot lighter when I leave, but my fingers are lot dirtier from picking up casings!
machine gun, .22, shotgun and all in between! I love my range! Just an old g-man/owner, no range nazi, or "bangers". Just good ol' folk trying to put more in the black.