The BL-10D fits the Canon 10D with the BG-ED3. Custom-made one-piece bracket machined from light weight 6061T6 aluminum. Allows full access to all switches and battery drawers. Allows access to the Canon Remote Switch.
Weight : 99 grams (3.5 ounces)
" Get an L-bracket
If you area keen tripod user, an L-bracket can make a massive difference. It allows effortless switching from horizontal to vertical framing, keeping all the weight on top and the lens in the same position. It´s far better than flipping the head 90 degrees, which can seriously unbalance the tripod and compromise stability"
(Article from Advanced Photographer UK)