Size: Twin Twin/Twin
Item Dimensions : 81.4"L x 44.8"W x 59.8"H
Mattress Platform :
    TWIN SIZE / 76.0"L x 39.3"W
Slats : 10(TWIN)+10(TWIN)+9(TWIN) pcs

Height between upper bunk bed slats and floor:44.375" 
Height between upper bunk bed slats and lower bunk bed slats: 30.5"

Trundle: 70.9"W x 40.6"D x 2.8"H
Trundle Panel : 75.5"W x 9.4" H
Trundle Mattress Platform :
    SIZE / 75.5"L x 39.3"W
Slats : 8 (Trundle) pcs

Main material : Solid Pine
Slats/Rail : Plywood
Side panels : MDF

Weight capacity : 525 lbs (TWIN BED : 175 lbs / Trundle : 200 lbs)
Product weight : 72.5 kg / 159.8 lb

Package Weight :
Package(1-2) :41.5 kg / 91.7 lb
Package (2-2) :36.5 kg / 80.7 lb

Package Dimension:
Package(1-2):207.5L x 34.5W x 17.5H cm / 81.7L x 13.59W x 6.89 H inch
Package(2-2):108L x 42W x 23W cm / 42.52L x 16.54W x 9.06H inch

You can also download the online instruction as follows:
ASSEMBLY INSTRUCTIONS