REI (Recreational equipment Inc) was the only place I have found that does backpacking rentals in the area. See links below. There is also an online rental place which will mail gear to wherever you want it. Other people have recommended it.
www.lowergear.com
Lower gear is a little cheaper even with shipping.
The advantage of REI is you can try the backpack on for size

Attached is also a document word and html (web) format with details about the four major pieces of equipment (backpack, sleeping bag, sleeping pad and tent) from Linda Conklin and Francy.

Rentals 2010
REI (Recreational Equipment Inc.) has rentals:
Member rates. Non members about 30% higher Only 2, 4 or 6 person tents:

Item	1st day	addl days	6 day
Backpack *	$12	$5	$37
Sleeping bag	$14	$4	$34
pad	$6	$3	$21
2 person tent	$15	$6	$45
Total			$137

  
 Reno (www.rei.com/stores/67) across US-395 from the airport off of Plumb lane: 
   222 Harvard Way, Reno, NV - (775) 828-9090
   Reno map https://donsnotes.com/tahoe/reno.htm
 
Roseville (www.rei.com/stores/74) Off I-80 coming from Sacramento:
  1148 Galleria Blvd., Roseville, CA (916) 724-6750
   I-80 Exit 105A for Atlantic St 0.3 mi
   Slight right at Taylor Rd      0.4 mi
   left at Roseville Pkwy         0.7 mi
   2nd right onto Galleria Blvd/N Harding Blvd 0.1
    
    Roseville map https://donsnotes.com/tahoe/i80-rsvl.html
  1148 Galleria Blvd., Roseville, CA (916) 724-6750
 

Truckee Hiking and Camping Stores:: (NO RENTALS)
  The Back Country 11400 Donner Pass Rd. Truckee 530 582-0909
  
  Granite Chief 11368 Donner Pass Rd, Truckee (530) 587-2809
  
  Truckee Sports Exchange - 10095 West River St, Truckee, CA - (530) 582-4510
  
  
  Truckee Map https://donsnotes.com/tahoe/i80-trk.html
  
  
 

https://donsnotes.com/ctl/introtobackpacking/bulletin3.html

last updated 4 May 2010